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Share capital and share premium (Tables)
 12 Months Ended
Dec. 31, 2018
Text block [abstract]  
Summary of Share Capital and Share Premium
Number of
shares
000s		      Share
capital
£m		      Share
premium
£m		  

At 1 January 2017

      822,127        205        2,597  

Issue of ordinary shares – share option schemes

      923        —          5  

Purchase of own shares

      (20,996 )       (5 )       —    
  

 

 

     

 

 

     

 

 

  

At 31 December 2017

      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