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Dividends (Details) - GBP (£)
£ / shares in Units, £ in Millions
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Dividend      
Dividends paid £ 229 £ 201 £ 122
Proposed dividend per share £ 0.0593    
Proposed dividend £ 150 150 130
2021 final dividend paid - 4.30p per share      
Dividend      
Dividends paid     £ 80
Dividends paid per share     £ 0.043
2022 interim dividend paid - 2.40p per share      
Dividend      
Dividends paid     £ 42
Dividends paid per share     £ 0.024
2022 final dividend paid - 5.15p per share      
Dividend      
Dividends paid   £ 131  
Dividends paid per share   £ 0.0515  
2023 interim dividend paid - 2.75p per share      
Dividend      
Dividends paid   £ 70  
Dividends paid per share   £ 0.0275  
2023 final dividend paid - 5.93p per share      
Dividend      
Dividends paid £ 149    
Dividends paid per share £ 0.0593    
2024 interim dividend paid - 3.16p per share      
Dividend      
Dividends paid £ 80    
Dividends paid per share £ 0.0316