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Other financial assets (Tables)
 12 Months Ended
Dec. 31, 2021
Text block [abstract]  
Summary of Other Financial Assets
All figures in £ millions
   
2021
      2020  
At beginning of year
   
 
138
 
      122  
Exchange differences
   
 
1
 
      (4 ) 
Acquisition of investments
   
 
4
 
      6  
Disposal of investments
   
 
(54
) 
      —    
Fair value movements
   
 
24
 
      14  
    
 
 
     
 
 
  
At end of year
   
 
113
 
      138