Disclosure Of Entity's Operating Segments [Text Block]
| Concept | 2023-01-01 to 2023-12-31 | 2023-01-01 to 2023-12-31 | As at 2023-12-31 | 2023-01-01 to 2023-12-31 | 2023-01-01 to 2023-12-31 | 2023-01-01 to 2023-12-31 | 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 | 2022-01-01 to 2022-12-31 | 2022-01-01 to 2022-12-31 | 
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Disclosure of entity's operating segments [text block] | — | 
                                                5 Segment Information and
                                                
                                             | — | — | — | — | — | — | — | — | — | — | 
| Disclosure of operating segments [text block] | — | — | — | — | — | — | — | — | — | — | — | — | 
| Disclosure of operating segments [abstract] | ||||||||||||
| Disclosure of operating segments [line items] | ||||||||||||
| Revenue | — | 
                                                491,000,000
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | — | — | — | — | — | — | — | 
                                                426,000,000
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | — | — | 
| Tax expense (income) | — | 
                                                1,100,000
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | — | — | — | — | — | — | — | 
                                                1,900,000
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | — | — | 
| Profit (loss) before tax | — | 
                                                7,600,000
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | — | — | — | — | — | — | — | 
                                                10,300,000
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | — | — | 
| Profit (loss) | 
                                                –
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | 
                                                6,500,000
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | — | 
                                                6,500,000
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | 
                                                –
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | 
                                                –
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | — | 
                                                –
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | 
                                                –
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | 
                                                8,400,000
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | 
                                                –
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | 
                                                8,400,000
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | 
| Assets | — | — | 
                                                219,400,000
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | — | — | — | 
                                                181,300,000
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | — | — | — | — | — | 
| Liabilities | — | — | 
                                                166,000,000
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | — | — | — | 
                                                142,600,000
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | — | — | — | — | — | 
| Cash flows from (used in) operating activities | — | 
                                                8,700,000
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | — | — | — | — | — | — | — | 
                                                10,600,000
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | — | — | 
| Cash flows from (used in) investing activities | — | 
                                                200,000
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | — | — | — | — | — | — | — | 
                                                1,800,000
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | — | — | 
| Cash flows from (used in) financing activities | — | 
                                                2,100,000
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | — | — | — | — | — | — | — | 
                                                6,600,000
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | — | — | 
| Disclosure of products and services [text block] | — | — | — | — | — | — | — | — | — | — | — | — | 
| Disclosure of products and services [abstract] | ||||||||||||
| Disclosure of products and services [line items] | ||||||||||||
| Disclosure of geographical areas [text block] | — | — | — | — | — | — | — | — | — | — | — | — | 
| Disclosure of geographical areas [abstract] | ||||||||||||
| Disclosure of geographical areas [line items] | ||||||||||||
| Disclosure of major customers [text block] | — | — | — | — | — | — | — | — | — | — | — | — | 
| Disclosure of major customers [abstract] | ||||||||||||
| Disclosure of major customers [line items] |