Statement Of Changes In Equity [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 | 
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of changes in equity [abstract] | ||||||||||||||
| Statement of changes in equity [line items] | ||||||||||||||
| Increase (decrease) through transactions with owners, equity | 
                                                —
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | 
                                                361,000
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | 
                                                —
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | 
                                                —
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | 
                                                —
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | 
                                                2 , 78 9
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | 
                                                3 ,1 5 0
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | 
                                                —
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | 
                                                —
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | 
                                                3 , 91 6
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | 
                                                3,08 5
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | 
                                                7,000
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | 
                                                1,000
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             | 
                                                823,000
                                                
                                                    
                                                        GBP
                                                    
                                                
                                             |