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Insurance service expenses and other expenditure - Exercise price ranges for options (Details) - Sharesave and ISSOSNE
 12 Months Ended
Dec. 31, 2024
Options
£ / shares
Dec. 31, 2023
Options
£ / shares
Dec. 31, 2022
Options
£ / shares
Dec. 31, 2021
Options
£ / shares
Summary of options exercise price range        
Outstanding - Number outstanding | Options 1,660,096 1,671,215 1,900,000 2,000,000
Outstanding - Weighted average remaining contractual life (years) 2 years 9 months 18 days 2 years 7 months 6 days 2 years 7 months 6 days  
Outstanding - Weighted average exercise prices £ 7.84 £ 9.5 £ 10.43 £ 11.6
Exercisable - Number exercisable | Options 200,000 200,000 300,000  
Exercisable - Weighted average exercise prices £ 11.57 £ 10.82 £ 12.48  
Minimum        
Summary of options exercise price range        
Exercise price 5.20 7.37    
Maximum        
Summary of options exercise price range        
Exercise price £ 12.02 £ 14.55    
Between 5 and 6        
Summary of options exercise price range        
Outstanding - Number outstanding | Options 500,000      
Outstanding - Weighted average remaining contractual life (years) 4 years 3 months 18 days      
Outstanding - Weighted average exercise prices £ 5.24      
Between 5 and 6 | Minimum        
Summary of options exercise price range        
Exercise price 5      
Between 5 and 6 | Maximum        
Summary of options exercise price range        
Exercise price £ 6      
Between 7 and 8        
Summary of options exercise price range        
Outstanding - Number outstanding | Options 700,000 700,000 500,000  
Outstanding - Weighted average remaining contractual life (years) 2 years 8 months 12 days 3 years 8 months 12 days 4 years 1 month 6 days  
Outstanding - Weighted average exercise prices £ 7.55 £ 7.55 £ 7.37  
Between 7 and 8 | Minimum        
Summary of options exercise price range        
Exercise price 7 7 7  
Between 7 and 8 | Maximum        
Summary of options exercise price range        
Exercise price £ 8 £ 8 £ 8  
Between 9 and 10        
Summary of options exercise price range        
Outstanding - Number outstanding | Options 100,000 300,000 400,000  
Outstanding - Weighted average remaining contractual life (years) 1 year 4 months 24 days 1 year 4 months 24 days 2 years 2 months 12 days  
Outstanding - Weighted average exercise prices £ 9.64 £ 9.64 £ 9.64  
Exercisable - Number exercisable | Options   100,000    
Exercisable - Weighted average exercise prices   £ 9.64    
Between 9 and 10 | Minimum        
Summary of options exercise price range        
Exercise price 9 9 9  
Between 9 and 10 | Maximum        
Summary of options exercise price range        
Exercise price £ 10 £ 10 £ 10  
Between 11 and 12        
Summary of options exercise price range        
Outstanding - Number outstanding | Options 400,000 600,000 800,000  
Outstanding - Weighted average remaining contractual life (years) 1 year 3 months 18 days 2 years 2 years 4 months 24 days  
Outstanding - Weighted average exercise prices £ 11.7 £ 11.59 £ 11.48  
Exercisable - Number exercisable | Options 200,000   200,000  
Exercisable - Weighted average exercise prices £ 11.57   £ 11.12  
Between 11 and 12 | Minimum        
Summary of options exercise price range        
Exercise price 11 11 11  
Between 11 and 12 | Maximum        
Summary of options exercise price range        
Exercise price £ 12 12 12  
Between 12 and 13        
Summary of options exercise price range        
Outstanding - Weighted average remaining contractual life (years) 7 months 6 days      
Outstanding - Weighted average exercise prices £ 12.02      
Between 12 and 13 | Minimum        
Summary of options exercise price range        
Exercise price 12 12 12  
Between 12 and 13 | Maximum        
Summary of options exercise price range        
Exercise price 13 £ 13 £ 13  
Between 13 and 14        
Summary of options exercise price range        
Outstanding - Number outstanding | Options   100,000 100,000  
Outstanding - Weighted average remaining contractual life (years)   4 months 24 days 1 year 4 months 24 days  
Outstanding - Weighted average exercise prices   £ 13.94 £ 13.94  
Exercisable - Number exercisable | Options   100,000    
Exercisable - Weighted average exercise prices   £ 13.94    
Between 13 and 14 | Minimum        
Summary of options exercise price range        
Exercise price 13 13 13  
Between 13 and 14 | Maximum        
Summary of options exercise price range        
Exercise price 14 14 £ 14  
Between 14 and 15        
Summary of options exercise price range        
Outstanding - Number outstanding | Options     100,000  
Outstanding - Weighted average remaining contractual life (years)     4 months 24 days  
Outstanding - Weighted average exercise prices     £ 14.55  
Exercisable - Number exercisable | Options     100,000  
Exercisable - Weighted average exercise prices     £ 14.55  
Between 14 and 15 | Minimum        
Summary of options exercise price range        
Exercise price 14 14 14  
Between 14 and 15 | Maximum        
Summary of options exercise price range        
Exercise price £ 15 £ 15 £ 15