Profit Or Loss [Abstract]
| Concept | 2023-12-31 to 2024-12-28 | 2023-12-31 to 2024-12-28 | 2023-12-31 to 2024-12-28 | 2023-12-31 to 2024-12-28 | 2023-01-01 to 2023-12-30 | 2023-01-01 to 2023-12-30 | 2023-01-01 to 2023-12-30 | 2023-01-01 to 2023-12-30 | 
|---|---|---|---|---|---|---|---|---|
| Profit or loss [abstract] | ||||||||
| Profit (loss) [abstract] | ||||||||
| Revenue | — | — | 
                                                96,000,000
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | — | — | — | 
                                                88,000,000
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | — | 
| Profit (loss) from operating activities | — | — | 
                                                4,200,000
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | — | — | — | 
                                                2,600,000
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | — | 
| Finance costs | — | — | 
                                                100,000
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | — | — | — | 
                                                200,000
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | — | 
| Profit (loss) before tax | — | — | 
                                                4,500,000
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | — | — | — | 
                                                3,100,000
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | — | 
| Tax expense (income) | — | — | 
                                                1,700,000
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | — | — | — | 
                                                400,000
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | — | 
| Profit (loss) from continuing operations | — | — | 
                                                2,800,000
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | — | — | — | 
                                                2,700,000
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | — | 
| Profit (loss) from discontinued operations | — | — | 
                                                800,000
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | — | — | — | 
                                                -
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | — | 
| Profit (loss) | 
                                                -
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | 
                                                -
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | 
                                                3,600,000
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | 
                                                3,600,000
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | 
                                                -
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | 
                                                2,700,000
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | 
                                                2,700,000
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | 
                                                -
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | 
| Earnings per share [text block] | — | — | — | — | — | — | — | — | 
| Earnings per share [abstract] | ||||||||
| Earnings per share [line items] | ||||||||
| Basic earnings per share [abstract] | ||||||||
| Basic earnings (loss) per share from continuing operations | — | — | 
                                                0.010
                                                
                                             | — | — | — | 
                                                0.010
                                                
                                             | — | 
| Basic earnings (loss) per share from discontinued operations | — | — | 
                                                0.003
                                                
                                             | — | — | — | 
                                                -
                                                
                                             | — | 
| Basic earnings (loss) per share | — | — | 
                                                0.013
                                                
                                             | — | — | — | 
                                                0.010
                                                
                                             | — | 
| Diluted earnings per share [abstract] | ||||||||
| Diluted earnings (loss) per share from continuing operations | — | — | 
                                                0.010
                                                
                                             | — | — | — | 
                                                0.010
                                                
                                             | — | 
| Diluted earnings (loss) per share from discontinued operations | — | — | 
                                                0.003
                                                
                                             | — | — | — | 
                                                -
                                                
                                             | — | 
| Diluted earnings (loss) per share | — | — | 
                                                0.013
                                                
                                             | — | — | — | 
                                                0.010
                                                
                                             | — |