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Inventories (Tables)
 12 Months Ended
Dec. 31, 2018
Text block [abstract]  
Summary of Current Inventories

All figures in £ millions

    2018      2017  

Raw materials

      5        4  

Work in progress

      —          2  

Finished goods

      149        142  

Returns asset

      10        —    
  

 

 

     

 

 

  
     164        148