Disclosure Of Financial Instruments [Text Block]
| Concept | 2024-01-01 to 2024-12-31 | 2023-01-01 to 2023-12-31 | 
|---|---|---|
| Disclosure of financial instruments [text block] |  | — | 
| Disclosure of financial liabilities [text block] |  | — | 
| Disclosure of hedge accounting [text block] |  | — | 
| Disclosure of general hedge accounting [text block] | — | — | 
| Disclosure of information about amounts that affected statement of comprehensive income as result of hedge accounting [text block] | — | — | 
| Disclosure of information about amounts that affected statement of comprehensive income as result of hedge accounting [abstract] | ||
| Disclosure of information about amounts that affected statement of comprehensive income as result of hedge accounting [line items] | ||
| Gains (losses) on hedges of net investments in foreign operations, net of tax | 
                                                2,000,000
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | 
                                                –
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | 
| Disclosure of nature and extent of risks arising from financial instruments [text block] | — | — | 
| Disclosure of nature and extent of risks arising from financial instruments [abstract] | ||
| Disclosure of nature and extent of risks arising from financial instruments [line items] | ||
| Sensitivity analysis for types of market risk [text block] |  | — | 
| Disclosure of credit risk [text block] | — | — | 
| Disclosure of credit risk exposure [text block] |  | — |