Statement Of Changes In Equity [Abstract]
| Concept | As at 2025-03-31 | As at 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 | As at 2024-03-31 | 2023-04-01 to 2024-03-31 | As at 2024-03-31 | 2023-04-01 to 2024-03-31 | As at 2024-03-31 | 2023-04-01 to 2024-03-31 | As at 2023-03-31 | As at 2023-03-31 | As at 2023-03-31 | 
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of changes in equity [abstract] | |||||||||||||||
| Statement of changes in equity [line items] | |||||||||||||||
| Equity | 
                                                208,953,833
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | 
                                                80,682,487
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | — | 
                                                128,271,346
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | — | — | 
                                                109,769,767
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | — | 
                                                208,953,833
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | — | 
                                                99,184,066
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | — | 
                                                71,236,648
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | 
                                                208,953,833
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | 
                                                137,717,185
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | 
| Changes in equity [abstract] | |||||||||||||||
| Comprehensive income [abstract] | |||||||||||||||
| Profit (loss) | — | — | — | — | 
                                                47,237,280
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | — | — | — | — | 
                                                46,097,418
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | — | — | — | — | — | 
| Comprehensive income | — | — | 
                                                –
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | — | 
                                                47,237,280
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | 
                                                47,237,280
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | — | 
                                                46,097,418
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | — | 
                                                46,097,418
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | — | 
                                                –
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | — | — | — | 
| Dividends recognised as distributions to owners | — | — | 
                                                –
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | — | 
                                                18,150,000
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | 
                                                18,150,000
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | — | 
                                                18,150,000
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | — | 
                                                18,150,000
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | — | 
                                                –
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | — | — | — |