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Held for sale (Tables)
 12 Months Ended
Dec. 31, 2022
Text block [abstract]  
Summary of Assets and Liabilities
The held for sale balances are analysed as follows:
 
     
                        
      
                        
  
     
All figures in £ millions
   
2022
Total
     
2021  
Total  
  
     
Non-current
assets
                  
     
Property, plant and equipment
   
 
16
 
   
 
7  
 
     
    
 
16
 
   
 
7  
 
     
                   
     
Assets classified as held for sale
   
 
16
 
   
 
7  
 
     
                   
     
Net assets classified as held for sale
   
 
16
 
   
 
7