Disclosure Of Non-Current Assets Held For Sale And Discontinued Operations [Text Block]
| Concept | 2023-01-01 to 2023-12-31 | 2022-01-01 to 2022-12-31 | 
|---|---|---|
| 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 | 
                                                7,600,000
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | 
                                                10,300,000
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | 
| Revenue | 
                                                491,000,000
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | 
                                                426,000,000
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | 
| Cash flows from continuing and discontinued operations [abstract] | ||
| Cash flows from (used in) operating activities [abstract] | ||
| Cash flows from (used in) operating activities | 
                                                8,700,000
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | 
                                                10,600,000
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | 
| Cash flows from (used in) investing activities [abstract] | ||
| Cash flows from (used in) investing activities | 
                                                200,000
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | 
                                                1,800,000
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | 
| Cash flows from (used in) financing activities [abstract] | ||
| Cash flows from (used in) financing activities | 
                                                2,100,000
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | 
                                                6,600,000
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             |