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Share capital and share premium (Tables)
 12 Months Ended
Dec. 31, 2019
Text block [abstract]  
Summary of Share Capital and Share Premium
 
  
Number of
shares
000s
 
  
Share
capital
£m
 
  
Share
premium
£m
 
At 1 January 2018
  
 
802,054
 
  
 
200
 
  
 
2,602
 
Issue of ordinary shares – share option schemes
  
 
864
 
  
 
1
 
  
 
5
 
Purchase of own shares
  
 
(21,840
) 
  
 
(6
) 
  
 
—  
 
  
 
 
   
 
 
   
 
 
 
At 31 December 2018
  
 
781,078
 
  
 
195
 
  
 
2,607
 
Issue of ordinary shares – share option schemes
  
 
1,021
 
  
 
—  
 
  
 
7
 
Purchase of own shares
  
 
—  
 
  
 
—  
 
  
 
—  
 
  
 
 
   
 
 
   
 
 
 
At 31 December 2019
  
 
782,099
 
  
 
195
 
  
 
2,614