Subclassifications Of Assets, Liabilities And Equities [Abstract]
| Concept | As at 2025-03-31 | As at 2024-03-31 | As at 2023-03-31 | 
|---|---|---|---|
| Subclassifications of assets, liabilities and equities [abstract] | |||
| Property, plant and equipment [abstract] | |||
| Property, plant and equipment | 
                                                18 , 593
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | 
                                                19,070,000
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | — | 
| Intangible assets and goodwill [abstract] | |||
| Intangible assets and goodwill | 
                                                3 3 ,  397
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | 
                                                36 , 275
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | — | 
| Investments accounted for using equity method [abstract] | |||
| Investments accounted for using equity method | 
                                                353,000
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | 
                                                159,000
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | — | 
| Trade and other non-current receivables [abstract] | |||
| Trade and other non-current receivables | 
                                                —
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | 
                                                —
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | — | 
| Trade and other current receivables [abstract] | |||
| Trade and other current receivables | 
                                                55, 2 88
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | 
                                                59,039,000
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | — | 
| Classes of current inventories [abstract] | |||
| Current inventories | 
                                                70 , 91 2
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | 
                                                73 ,4 03
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | — | 
| Classes of current inventories, alternative [abstract] | |||
| Cash and cash equivalents [abstract] | |||
| Cash and cash equivalents | 
                                                24,258,000
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | 
                                                20, 8 8 4
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | 
                                                31, 798
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | 
| Non-current assets or disposal groups classified as held for sale or as held for distribution to owners [abstract] | |||
| Non-current assets or disposal groups classified as held for sale | 
                                                —
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | 
                                                623,000
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | — | 
| Borrowings [abstract] | |||
| Non-current portion of non-current borrowings | 
                                                41, 6 27
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | 
                                                41 ,8 48
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | — | 
| Current borrowings and current portion of non-current borrowings [abstract] | |||
| Current borrowings | 
                                                —
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | 
                                                —
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | — | 
| Non-current portion of non-current borrowings, by type [abstract] | |||
| Trade and other non-current payables [abstract] | |||
| Other non-current payables | 
                                                5 43
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | 
                                                8 92
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | — | 
| Trade and other current payables [abstract] | |||
| Trade and other current payables | 
                                                34,5 89
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | 
                                                36 ,2 18
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | — | 
| Issued capital [abstract] | |||
| Issued capital | 
                                                6,806,000
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | 
                                                6, 806
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | — | 
| Retained earnings [abstract] | |||
| Retained earnings | 
                                                6 8 ,095
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | 
                                                70 , 2 0 5
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | — | 
| Accumulated other comprehensive income [abstract] | |||
| Reserve of exchange differences on translation | 
                                                9, 1 47
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | 
                                                10,49 6
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | — | 
| Miscellaneous equity [abstract] | |||
| Merger reserve | 
                                                16,328,000
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | 
                                                16 , 328
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | — | 
| Net assets (liabilities) [abstract] | |||
| Assets | 
                                                229,00 3
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | 
                                                230,159,000
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | — | 
| Liabilities | 
                                                1 0 7, 9 2 3
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | 
                                                105,981,000
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | — | 
| Assets (liabilities) | 
                                                121, 080
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | 
                                                1 24  ,17 8
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | — | 
| Net current assets (liabilities) [abstract] | |||
| Current assets | 
                                                150,45 8
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | 
                                                15 3, 9 49
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | — | 
| Current liabilities | 
                                                41 ,1 6 5
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | 
                                                4 4, 557
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | — | 
| Assets less current liabilities [abstract] |