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Dividends (Details) - GBP (£)
£ / shares in Units, £ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Dividend      
Dividends paid £ 201 £ 122 £ 139
Proposed dividend per share £ 0.0593    
Proposed dividend £ 150 130 80
2020 final dividend paid - 5.41p per share      
Dividend      
Dividends paid     £ 100
Dividends paid per share     £ 0.0541
2021 interim dividend paid - 2.09p per share      
Dividend      
Dividends paid     £ 39
Dividends paid per share     £ 0.0209
2021 final dividend paid - 4.30p per share      
Dividend      
Dividends paid   £ 80  
Dividends paid per share   £ 0.0430  
2022 interim dividend paid - 2.40p per share      
Dividend      
Dividends paid   £ 42  
Dividends paid per share   £ 0.0240  
2022 final dividend paid - 5.15p per share      
Dividend      
Dividends paid £ 131    
Dividends paid per share £ 5.15    
2023 interim dividend paid - 2.75p per share      
Dividend      
Dividends paid £ 70    
Dividends paid per share £ 0.0275