Disclosure Of Investment Property [Text Block]
| Concept | As at 2022-12-31 | 2022-01-01 to 2022-12-31 | 2022-01-01 to 2022-12-31 | 2022-01-01 to 2022-12-31 | As at 2021-12-31 | 2021-01-01 to 2021-12-31 | 2021-01-01 to 2021-12-31 | 2021-01-01 to 2021-12-31 | 
|---|---|---|---|---|---|---|---|---|
| Disclosure of investment property [text block] | — | — | — |  | — | — | — | — | 
| Disclosure of detailed information about investment property [text block] | — | — | — | — | — | — | — | — | 
| Disclosure of detailed information about investment property [abstract] | ||||||||
| Disclosure of detailed information about investment property [line items] | ||||||||
| Reconciliation of changes in investment property [abstract] | ||||||||
| Investment property | 
                                                71,160,000
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | — | — | — | 
                                                87 ,565
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | — | — | — | 
| Changes in investment property [abstract] | ||||||||
| Gains (losses) on fair value adjustment, investment property | — | 
                                                10,381,000
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | 
                                                –
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | 
                                                10,381,000
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | — | 
                                                8  ,  7  5  5
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | 
                                                –
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | 
                                                8  ,  7  5  5
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | 
| Rental income from investment property, net of direct operating expense [abstract] | ||||||||
| Rental income from investment property | — | 
                                                –
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | 
                                                5,608,000
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | 
                                                5,608,000
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | — | 
                                                –
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | 
                                                5,928,000
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | 
                                                5,928,000
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | 
| Direct operating expense from investment property [abstract] | ||||||||
| Direct operating expense from investment property | — | 
                                                –
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | 
                                                333,000
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | 
                                                333,000
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | — | 
                                                –
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | 
                                                670,000
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | 
                                                670,000
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | 
| Rental income from investment property, net of direct operating expense | — | 
                                                –
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | 
                                                5,275,000
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | 
                                                5,275,000
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | — | 
                                                –
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | 
                                                5, 258
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | 
                                                5,258,000
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             |