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Share capital and share premium (Tables)
 12 Months Ended
Dec. 31, 2017
Text block1 [abstract]  
Summary of Share Capital and Share Premium
     Number
of shares
000s		     Share
capital
£m		     Share
premium
£m		  

At 1 January 2016

      821,068       205       2,590  

Issue of ordinary shares – share option schemes

      1,059       —       7  
  

 

 

    

 

 

    

 

 

  

At 31 December 2016

      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