Disclosure Of Interests In Other Entities [Text Block]
| 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 | As at 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 | As at 2024-03-31 | 2023-04-01 to 2024-03-31 | 2023-04-01 to 2024-03-31 | As at 2023-03-31 | 
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Disclosure of interests in other entities [text block] | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 
| Disclosure of interests in subsidiaries [text block] | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 
| Disclosure of composition of group [text block] | — | — | — | — | — | — |  | — | — | — | — | — | — | — | — | — | — | 
| Disclosure of subsidiaries [text block] | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 
| Disclosure of subsidiaries [abstract] | |||||||||||||||||
| Disclosure of subsidiaries [line items] | |||||||||||||||||
| Current assets | — | — | — | — | — | 
                                                150,45 8
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | — | — | — | — | — | — | — | 
                                                15 3, 9 49
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | — | — | — | 
| Non-current assets | — | — | — | — | — | 
                                                78, 545
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | — | — | — | — | — | — | — | 
                                                7 6,210
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | — | — | — | 
| Current liabilities | — | — | — | — | — | 
                                                41 ,1 6 5
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | — | — | — | — | — | — | — | 
                                                4 4, 557
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | — | — | — | 
| Non-current liabilities | — | — | — | — | — | 
                                                66,758,000
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | — | — | — | — | — | — | — | 
                                                6 1 ,  424
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | — | — | — | 
| Revenue | — | — | — | — | — | — | 
                                                223,466,000
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | — | — | — | — | — | 
                                                23 3, 67 1
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | — | — | — | — | 
| Profit (loss) | 
                                                —
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | 
                                                —
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | 
                                                —
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | 
                                                —
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | 
                                                —
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | — | 
                                                1,0 40
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | 
                                                1 ,04 0
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | 
                                                —
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | 
                                                —
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | 
                                                —
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | 
                                                4 , 4 4 0
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | 
                                                4 , 4 4 0
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | — | 
                                                —
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | 
                                                —
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | — | 
| Comprehensive income | 
                                                —
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | 
                                                —
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | 
                                                —
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | 
                                                1,349,000
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | 
                                                —
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | — | 
                                                3 09
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | 
                                                1 ,0 40
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | 
                                                —
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | 
                                                —
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | 
                                                4 , 1 8 6
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | 
                                                4 , 4 4 0
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | 
                                                8, 626
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | — | 
                                                —
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | 
                                                —
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | — | 
| Disclosure of interests in associates [text block] | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 
| Disclosure of associates [text block] | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 
| Disclosure of associates [abstract] | |||||||||||||||||
| Disclosure of associates [line items] | |||||||||||||||||
| Other comprehensive income | 
                                                —
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | 
                                                —
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | 
                                                —
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | 
                                                1,34 9
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | 
                                                —
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | — | 
                                                1,349,000
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | 
                                                —
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | 
                                                —
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | 
                                                —
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | 
                                                4 , 1 8 6
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | 
                                                —
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | 
                                                4 , 1 8 6
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | — | 
                                                —
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | 
                                                —
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | — | 
| Investments accounted for using equity method | — | — | — | — | — | 
                                                353,000
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | — | — | — | — | — | — | — | 
                                                159,000
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | — | — | — | 
| Disclosure of interests in joint arrangements [text block] | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 
| Disclosure of joint ventures [text block] | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 
| Disclosure of joint ventures [abstract] | |||||||||||||||||
| Disclosure of joint ventures [line items] | |||||||||||||||||
| Cash and cash equivalents | — | — | — | — | — | 
                                                24,258,000
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | — | — | — | — | — | — | — | 
                                                20, 8 8 4
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | — | — | 
                                                31, 798
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | 
| Tax expense (income) | — | — | — | — | — | — | 
                                                3,888,000
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | — | — | — | — | — | 
                                                3 ,65 1
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | — | — | — | — |