Statement Of Changes In Net Assets Available For Benefits [Abstract]
| Concept | 2024-04-01 to 2025-03-31 | 2023-04-01 to 2024-03-31 | 
|---|---|---|
| Statement of changes in net assets available for benefits [abstract] | ||
| Reconciliation of changes in net assets available for benefits [abstract] | ||
| Changes in net assets available for benefits [abstract] | ||
| Other income | 
                                                76 6
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | 
                                                721,000
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | 
| Administrative expenses | 
                                                4 7, 0 2 1
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | 
                                                4 8 , 6 3 5
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | 
| Tax expense (income) | 
                                                3,888,000
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | 
                                                3 ,65 1
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             |