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Inventories (Tables)
12 Months Ended
Dec. 31, 2021
Text block [abstract]  
Summary of Current Inventories
 
All figures in £ millions
  
2021
    
2020
 
Raw materials
  
 
7
 
     5  
Work in progress
  
 
2
 
     2  
Finished goods
  
 
84
 
     116  
Returns asset
  
 
5
 
     6  
    
 
 
    
 
 
 
    
98
     129