Analysis Of Income And Expense [Abstract]
| Concept | 2024-04-01 to 2025-03-31 | 2024-04-01 to 2025-03-31 | 2024-04-01 to 2025-03-31 | 2024-04-01 to 2025-03-31 | 2024-04-01 to 2025-03-31 | 2024-04-01 to 2025-03-31 | 2024-04-01 to 2025-03-31 | 2023-04-01 to 2024-03-31 | 2023-04-01 to 2024-03-31 | 2023-04-01 to 2024-03-31 | 2023-04-01 to 2024-03-31 | 2023-04-01 to 2024-03-31 | 2023-04-01 to 2024-03-31 | 2023-04-01 to 2024-03-31 | 
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Analysis of income and expense [abstract] | ||||||||||||||
| Revenue [abstract] | ||||||||||||||
| Revenue | — | — | — | — | — | 
                                                223,466,000
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | — | — | — | — | 
                                                23 3, 67 1
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | — | — | — | 
| Material income and expense [abstract] | ||||||||||||||
| Expense of restructuring activities | — | — | — | — | — | 
                                                2 ,575
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | — | — | — | — | 
                                                1, 491
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | — | — | — | 
| Finance income (cost) | — | — | — | — | — | 
                                                4 , 4 9 9
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | — | — | — | — | 
                                                5 ,41 9
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | — | — | — | 
| Expenses by nature [abstract] | ||||||||||||||
| Depreciation, amortisation and impairment loss (reversal of impairment loss) recognised in profit or loss [abstract] | ||||||||||||||
| Depreciation and amortisation expense [abstract] | ||||||||||||||
| Amortisation expense | — | — | — | — | — | 
                                                1,7 31
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | — | — | — | — | 
                                                1 ,78 0
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | — | — | — | 
| Disclosure of attribution of expenses by nature to their function [text block] | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 
| Disclosure of attribution of expenses by nature to their function [abstract] | ||||||||||||||
| Disclosure of attribution of expenses by nature to their function [line items] | ||||||||||||||
| Miscellaneous other comprehensive income [abstract] | ||||||||||||||
| Other comprehensive income, net of tax, exchange differences on translation of foreign operations and hedges of net investments in foreign operations [abstract] | ||||||||||||||
| Other comprehensive income, net of tax, exchange differences on translation of foreign operations | — | — | — | — | — | 
                                                2  ,0 2 4
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | — | — | — | — | 
                                                5 ,07 5
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | — | — | — | 
| Share of profit (loss) of associates and joint ventures accounted for using equity method [abstract] | ||||||||||||||
| Share of profit (loss) of associates accounted for using equity method | — | — | — | — | — | 
                                                199,000
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | — | — | — | — | 
                                                9 0
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | — | — | — | 
| Comprehensive income, continuing and discontinued operations [abstract] | ||||||||||||||
| Comprehensive income | 
                                                —
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | 
                                                —
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | 
                                                —
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | 
                                                1,349,000
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | 
                                                —
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | 
                                                3 09
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | 
                                                1 ,0 40
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | 
                                                —
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | 
                                                4 , 1 8 6
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | 
                                                4 , 4 4 0
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | 
                                                8, 626
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | 
                                                —
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | 
                                                —
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | 
                                                —
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | 
| Comprehensive income attributable to owners of parent, continuing and discontinued operations [abstract] | ||||||||||||||
| Comprehensive income, attributable to owners of parent | — | — | — | — | — | 
                                                3 0 9
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | — | — | — | — | 
                                                8 , 6 2 6
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | — | — | — |