Disclosure Of Property, Plant And Equipment [Text Block]
| Concept | 
                                    
                                        2022-01-01 to 2022-12-31  | 
                            
                                
                                    
                                        As at 2022-12-31  | 
                            
                                
                                    
                                        As at 2021-12-31  | 
                            
                        
|---|---|---|---|
| Disclosure of property, plant and equipment [text block] | 
                                        
                                             
                                                15. Property, plant and equipment – Group
                                                
                                             
                                        
                                     | 
                                
                                    — | — | 
| Disclosure of detailed information about property, plant and equipment [text block] | — | — | — | 
| Disclosure of detailed information about property, plant and equipment [abstract] | |||
| Disclosure of detailed information about property, plant and equipment [line items] | |||
| Reconciliation of changes in property, plant and equipment [abstract] | |||
| Property, plant and equipment | — | 
                                        
                                             
                                                2,999,000
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                3,925,000
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             
                                        
                                     |