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Inventories (Tables)
12 Months Ended
Dec. 31, 2022
Text block [abstract]  
Summary of Current Inventories
     
All figures in £ millions
  
2022
   
2021
 
     
Raw materials
  
 
5
 
 
 
7
  
     
Work in progress
  
 
2
 
 
 
2
 
     
Finished goods
  
 
93
  
 
 
84
 
     
Returns asset
  
 
5
 
 
 
5
 
     
 
  
 
           105
 
 
 
             98