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Share capital and share premium (Tables)
 12 Months Ended
Dec. 31, 2022
Text block [abstract]  
Summary of Share Capital and Share Premium
       
     
  Number of
shares
000s
    
Share
          capital
£m
    
Share
      premium
£m
  
       
At 1 January 2021
   
 
753,258
 
  
 
188
 
  
 
2,620
 
       
Issue of ordinary shares – share option schemes
   
 
3,544
 
  
 
1
 
  
 
6
 
       
Purchase of own shares
   
 
–
 
  
 
–
 
  
 
–
 
       
At 31 December 2021
   
 
756,802
 
  
 
189
 
  
 
2,626
 
       
Issue of ordinary shares – share option schemes
   
 
1,199
 
  
 
–
 
  
 
7
 
       
Purchase of own shares
   
 
(42,268
) 
  
 
(10
) 
  
 
–
 
       
At 31 December 2022
   
 
  715,733
 
  
 
179
 
  
 
2,633