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Treasury shares (Tables)
 12 Months Ended
Dec. 31, 2022
Text block [abstract]  
Schedule of Treasury Shares
     
     
    Number of
shares
000s
    
              £m
  
     
At 1 January 2021
   
 
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
 
     
Purchase of treasury shares
   
 
4,513
 
  
 
37
 
     
Release of treasury shares
   
 
(4,220
) 
  
 
(34
) 
     
At 31 December 2022
   
 
1,864
 
  
 
15