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Treasury shares (Tables)
 12 Months Ended
Dec. 31, 2021
Text block [abstract]  
Schedule of Treasury Shares
    
Number of
shares
000s
     
£m
  
At 1 January 2020
      3,258        24  
Purchase of treasury shares
      1,105        6  
Release of treasury shares
      (3,460 )       (23 ) 
    
 
 
     
 
 
  
At 31 December 2020
      903        7  
Purchase of treasury shares
   
 
2,158
 
   
 
16
 
Newly issued treasury shares
   
 
2,500
 
   
 
1
 
Release of treasury shares
   
 
(3,990
) 
   
 
(12
) 
    
 
 
     
 
 
  
At 31 December 2021
   
 
1,571
 
   
 
12