Statement Of Financial Position [Abstract]
| Concept | As at 2022-12-31 | As at 2022-12-31 | As at 2022-12-31 | As at 2022-12-31 | As at 2022-12-31 | As at 2022-12-31 | As at 2022-12-31 | As at 2022-12-31 | As at 2022-12-31 | As at 2021-12-31 | As at 2021-12-31 | As at 2021-12-31 | As at 2021-12-31 | As at 2021-12-31 | As at 2021-12-31 | As at 2021-12-31 | As at 2021-12-31 | As at 2021-12-31 | As at 2020-12-31 | As at 2020-12-31 | As at 2020-12-31 | As at 2020-12-31 | As at 2020-12-31 | As at 2020-12-31 | As at 2020-12-31 | As at 2020-12-31 | As at 2020-12-31 | 
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of financial position [abstract] | |||||||||||||||||||||||||||
| Assets [abstract] | |||||||||||||||||||||||||||
| Non-current assets [abstract] | |||||||||||||||||||||||||||
| Investment property | 
                                                71,160,000
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | 
                                                87 ,565
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 
| Non-current assets | 
                                                71,160,000
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | 
                                                87 ,565
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 
| Current assets [abstract] | |||||||||||||||||||||||||||
| Trade and other current receivables | 
                                                1,143,000
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | 
                                                2,87 6
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 
| Cash and cash equivalents | 
                                                7, 2 0 6
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | 
                                                5,715,000
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | — | 
                                                3, 295
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | — | — | 
| Non-current assets or disposal groups classified as held for sale or as held for distribution to owners | 
                                                6, 750
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | 
                                                –
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 
| Current assets | 
                                                15,099,000
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | 
                                                8,591,000
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 
| Assets | 
                                                86,259,000
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | 
                                                96,156,000
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 
| Equity and liabilities [abstract] | |||||||||||||||||||||||||||
| Equity [abstract] | |||||||||||||||||||||||||||
| Issued capital | 
                                                1,299,000
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | 
                                                1,296,000
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 
| Retained earnings | 
                                                13,481,000
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | 
                                                15,7 69
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 
| Share premium | 
                                                226,000
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | 
                                                117,000
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 
| Equity attributable to owners of parent | 
                                                56,176,000
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | 
                                                66,117,000
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 
| Equity | 
                                                56,176,000
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | 
                                                29,623,000
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | 
                                                11,499,000
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | 
                                                226,000
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | 
                                                160,000
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | 
                                                95,000
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | 
                                                13,481,000
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | 
                                                1,299,000
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | 
                                                207,000
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | 
                                                15,7 69
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | 
                                                95,000
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | 
                                                66,117,000
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | 
                                                29,623,000
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | 
                                                19,236,000
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | 
                                                121,000
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | 
                                                117,000
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | 
                                                102,000
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | 
                                                1,296,000
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | 
                                                13,882,000
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | 
                                                1,294,000
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | 
                                                12,814,000
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | 
                                                28,995,000
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | 
                                                51,000
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | 
                                                43,000
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | 
                                                57 ,121
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | 
                                                95,000
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | 
                                                53,000
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | 
| Liabilities [abstract] | |||||||||||||||||||||||||||
| Non-current liabilities [abstract] | |||||||||||||||||||||||||||
| Non-current liabilities | 
                                                27 ,200
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | 
                                                19, 700
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 
| Current liabilities [abstract] | |||||||||||||||||||||||||||
| Trade and other current payables | 
                                                2, 883
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | 
                                                2, 839
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 
| Current liabilities | 
                                                2,883,000
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | 
                                                10,339,000
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 
| Liabilities | 
                                                30,083,000
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | 
                                                30,039,000
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |