Disclosure Of Entity's Operating Segments [Text Block]
| Concept | 2023-12-31 to 2024-12-28 | 2023-12-31 to 2024-12-28 | 2023-12-31 to 2024-12-28 | As at 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 | As at 2023-12-30 | 2023-01-01 to 2023-12-30 | 
|---|---|---|---|---|---|---|---|---|---|---|
| Disclosure of entity's operating segments [text block] | — | — | — | — | — | — | — | — | — | — | 
| Disclosure of operating segments [text block] | — | — | — | — | — | — | — | — | — | — | 
| Disclosure of operating segments [abstract] | ||||||||||
| Disclosure of operating segments [line items] | ||||||||||
| Revenue | — | — | 
                                                96,000,000
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | — | — | — | — | 
                                                88,000,000
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | — | — | 
| Interest income | — | — | 
                                                400,000
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | — | — | — | — | 
                                                700,000
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | — | — | 
| Tax expense (income) | — | — | 
                                                1,700,000
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | — | — | — | — | 
                                                400,000
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | — | — | 
| Profit (loss) before tax | — | — | 
                                                4,500,000
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | — | — | — | — | 
                                                3,100,000
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | — | — | 
| Profit (loss) from continuing operations | — | — | 
                                                2,800,000
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | — | — | — | — | 
                                                2,700,000
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | — | — | 
| Profit (loss) | 
                                                -
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | 
                                                -
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | 
                                                3,600,000
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | — | 
                                                3,600,000
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | 
                                                -
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | 
                                                2,700,000
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | 
                                                2,700,000
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | — | 
                                                -
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | 
| Assets | — | — | — | 
                                                60,300,000
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | — | — | — | — | 
                                                57,400,000
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | — | 
| Liabilities | — | — | — | 
                                                22,700,000
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | — | — | — | — | 
                                                21,900,000
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | — | 
| Cash flows from (used in) operating activities | — | — | 
                                                5,500,000
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | — | — | — | — | 
                                                4,400,000
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | — | — | 
| Cash flows from (used in) investing activities | — | — | 
                                                2,600,000
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | — | — | — | — | 
                                                17,300,000
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | — | — | 
| Cash flows from (used in) financing activities | — | — | 
                                                2,700,000
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | — | — | — | — | 
                                                3,400,000
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | — | — | 
| Disclosure of products and services [text block] | — | — | — | — | — | — | — | — | — | — | 
| Disclosure of products and services [abstract] | ||||||||||
| Disclosure of products and services [line items] | ||||||||||
| Disclosure of geographical areas [text block] | — | — | — | — | — | — | — | — | — | — | 
| Disclosure of geographical areas [abstract] | ||||||||||
| Disclosure of geographical areas [line items] | ||||||||||
| Disclosure of major customers [text block] | — | — | — | — | — | — | — | — | — | — | 
| Disclosure of major customers [abstract] | ||||||||||
| Disclosure of major customers [line items] |