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Other financial assets (Tables)
 12 Months Ended
Dec. 31, 2023
Text block [abstract]  
Summary of Other Financial Assets
All figures in £ millions   
 
    2023
    
 
    2022
  
At 1 January
   
 
133
 
     113  
Exchange differences
   
 
(5
) 
     9  
Acquisition of investments
   
 
8
 
     12  
Disposal of investments
   
 
(7
) 
     (48 ) 
Fair value movements – OCI
   
 
1
 
     18  
Fair value movements – income statement
   
 
13
 
     29  
At 31 December
   
 
143
 
     133