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Dividends (Details) - GBP (£)
£ / shares in Units, £ in Millions
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dividend    
Dividends paid £ 122 £ 139
Proposed dividend per share £ 0.0515 £ 0.0430
Proposed dividend £ 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