Disclosure Of Fair Value Measurement [Text Block]
| 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 | 
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Disclosure of fair value measurement [text block] | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 
| Disclosure of fair value measurement of assets [text block] | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 
| Disclosure of fair value measurement of assets [abstract] | |||||||||||||||||||||||||||
| Disclosure of fair value measurement of assets [line items] | |||||||||||||||||||||||||||
| Assets | 
                                                86,259,000
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | 
                                                96,156,000
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 
| Reconciliation of changes in fair value measurement, assets [abstract] | |||||||||||||||||||||||||||
| Disclosure of fair value measurement of liabilities [text block] | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 
| Disclosure of fair value measurement of liabilities [abstract] | |||||||||||||||||||||||||||
| Disclosure of fair value measurement of liabilities [line items] | |||||||||||||||||||||||||||
| Liabilities | 
                                                30,083,000
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | 
                                                30,039,000
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 
| Reconciliation of changes in fair value measurement, liabilities [abstract] | |||||||||||||||||||||||||||
| Disclosure of fair value measurement of equity [text block] | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 
| Disclosure of fair value measurement of equity [abstract] | |||||||||||||||||||||||||||
| Disclosure of fair value measurement of equity [line items] | |||||||||||||||||||||||||||
| 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
                                                    
                                                
                                             | 
| Reconciliation of changes in fair value measurement, entity's own equity instruments [abstract] |