Disclosure Of Intangible Assets [Text Block]
| Concept | 2023-12-31 to 2024-12-28 | As at 2024-12-28 | As at 2023-12-30 | 
|---|---|---|---|
| Disclosure of intangible assets [text block] |  | — | — | 
| Disclosure of detailed information about intangible assets [text block] | — | — | — | 
| Disclosure of detailed information about intangible assets [abstract] | |||
| Disclosure of detailed information about intangible assets [line items] | |||
| Reconciliation of changes in intangible assets other than goodwill [abstract] | |||
| Intangible assets other than goodwill | — | 
                                                12,000,000
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | 
                                                11,600,000
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             |