Disclosure Of Property, Plant And Equipment [Text Block]
| Concept | 2023-12-31 to 2024-12-28 | As at 2024-12-28 | As at 2023-12-30 | 
|---|---|---|---|
| Disclosure of property, plant and equipment [text block] |  | — | — | 
| Disclosure of detailed information about property, plant and equipment [text block] | — | — | — | 
| Disclosure of detailed information about property, plant and equipment [abstract] | |||
| Disclosure of detailed information about property, plant and equipment [line items] | |||
| Reconciliation of changes in property, plant and equipment [abstract] | |||
| Property, plant and equipment | — | 
                                                900,000
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | 
                                                1,100,000
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             |