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Inventories (Tables)
12 Months Ended
Dec. 31, 2019
Text block [abstract]  
Summary of Current Inventories
All figures in £ millions
  
2019
 
  
2018
 
Raw materials
  
 
5
 
  
 
5
 
Work in progress
  
 
2
 
  
 
—  
 
Finished goods
  
 
155
 
  
 
149
 
Returns asset
  
 
7
 
  
 
10
 
  
 
 
   
 
 
 
  
 
169
 
  
 
164