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Share capital and share premium (Tables)
 12 Months Ended
Dec. 31, 2023
Statement [line items]  
Summary of Share Capital and Share Premium
     
 
 Number of
shares
000s
    
 
Share
 capital
£m
    
 
Share
 premium
£m
  
At 31 December 2021      756,802       189       2,626  
Issue of ordinary shares – share option schemes      1,199       –       7  
Buyback of equity      (42,268 )      (10 )      –  
At 31 December 2022
      715,733       179       2,633  
Issue of ordinary shares – share option schemes   
 
1,809
 
  
 
–
 
  
 
9
 
Buyback of equity   
 
(20,243
) 
  
 
(5
) 
  
 
–
 
At 31 December 2023
   
 
697,299
 
  
 
174
 
  
 
2,642