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Other financial assets (Tables)
 12 Months Ended
Dec. 31, 2018
Text block [abstract]  
Summary of Other Financial Assets

All figures in £ millions

    2018     2017  

At beginning of year

      77       65  

Exchange differences

      4       (4 ) 

Acquisition of investments

      13       3  

Fair value movements

      7       13  

Disposal of investments

      (8 )      —    
  

 

 

    

 

 

  

At end of year

      93       77