Disclosure Of Non-Current Assets Held For Sale And Discontinued Operations [Text Block]
| Concept | 2024-01-01 to 2024-12-31 | 2023-01-01 to 2023-12-31 | 
|---|---|---|
| Disclosure of non-current assets held for sale and discontinued operations [text block] | — | — | 
| Disclosure of analysis of single amount of discontinued operations [text block] | — | — | 
| Disclosure of analysis of single amount of discontinued operations [abstract] | ||
| Disclosure of analysis of single amount of discontinued operations [line items] | ||
| Profit (loss) before tax | 
                                                103,400,000
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | 
                                                18,800,000
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | 
| Revenue | 
                                                283,600,000
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | 
                                                306. 9
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | 
| Profit (loss) from discontinued operations | 
                                                –
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | 
                                                66,000,000
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | 
| Cash flows from continuing and discontinued operations [abstract] | ||
| Cash flows from (used in) operating activities [abstract] | ||
| Cash flows from (used in) operating activities | 
                                                12,700,000
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | 
                                                16. 1
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | 
| Cash flows from (used in) investing activities [abstract] | ||
| Cash flows from (used in) investing activities | 
                                                12,600,000
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | 
                                                20 .8
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | 
| Cash flows from (used in) financing activities [abstract] | ||
| Cash flows from (used in) financing activities | 
                                                7. 0
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | 
                                                23,400,000
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             |