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Inventories (Tables)
12 Months Ended
Dec. 31, 2023
Text block [abstract]  
Summary of Current Inventories
 
All figures in £ millions
  
 
    2023
    
 
   2022
 
Raw materials   
 
4
 
     5  
Work in progress   
 
1
 
     2  
Finished goods   
 
81
 
     93  
Returns asset   
 
5
 
     5  
 
  
 
91
 
     105