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Other financial assets (Tables)
 12 Months Ended
Dec. 31, 2022
Text block [abstract]  
Summary of Other Financial Assets
 
     
All figures in £ millions
   
2022
    
2021
1
  
     
At beginning of year
   
 
113
 
  
 
138
 
     
Exchange differences
   
 
9
 
  
 
1
 
     
Acquisition of investments
   
 
12
 
  
 
4
 
     
Disposal of investments
   
 
(48
) 
  
 
(54
) 
     
Fair value movements - OCI
   
 
18
 
  
 
4
 
     
Fair value movements - income statement
   
 
29
 
  
 
20
 
     
At end of year
   
 
           133
 
  
 
               113
 
 
1.
  Comparative balances have been restated – see Note 1b.