Disclosure Of Insurance Contracts [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 | 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 | 
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Disclosure of insurance contracts [text block] | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 
| Disclosure of adjustments made when entity changed basis of disaggregation of insurance finance income (expenses) between profit or loss and other comprehensive income for contracts with direct participation features [text block] | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 
| Disclosure of adjustments made when entity changed basis of disaggregation of insurance finance income (expenses) between profit or loss and other comprehensive income for contracts with direct participation features [abstract] | ||||||||||||||
| Disclosure of adjustments made when entity changed basis of disaggregation of insurance finance income (expenses) between profit or loss and other comprehensive income for contracts with direct participation features [line items] | ||||||||||||||
| Profit (loss) | 
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                                                        GBP
                                                    
                                                
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                                                1,0 40
                                                
                                                    
                                                        GBP
                                                    
                                                
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                                                1 ,04 0
                                                
                                                    
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                                                —
                                                
                                                    
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                                                        GBP
                                                    
                                                
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                                                4 , 4 4 0
                                                
                                                    
                                                        GBP
                                                    
                                                
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                                                4 , 4 4 0
                                                
                                                    
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                                                —
                                                
                                                    
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