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Net finance costs
 12 Months Ended
Dec. 31, 2021
Text block [abstract]  
Net finance costs
6. Net finance costs
 
All figures in £ millions
    Notes     
2021
      2020      2019  
Interest payable on financial liabilities at amortised cost and associated derivatives
            
 
(41
) 
      (38 )       (22 ) 
Interest on lease liabilities
            
 
(27
) 
      (41 )       (45 ) 
Net foreign exchange losses
            
 
—  
 
      (6 )       (5 ) 
Derivatives not in a hedge relationship
            
 
—  
 
      (22 )       (12 ) 
             
 
 
     
 
 
     
 
 
  
Finance costs
            
 
(68
) 
      (107 )       (84 ) 
             
 
 
     
 
 
     
 
 
  
Interest receivable on financial assets at amortised cost
            
 
5
 
      9        15  
Interest on lease receivables
            
 
6
 
      9        11  
Net finance income in respect of retirement benefits
      25     
 
4
 
      6        13  
Fair value remeasurement of disposal proceeds
            
 
6
 
      26        —    
Net foreign exchange gains
            
 
1
 
      —         
—

  
Derivatives not in a hedge relationship
            
 
20
 
      —          2  
             
 
 
     
 
 
     
 
 
  
Finance income
            
 
42
 
      50        41  
             
 
 
     
 
 
     
 
 
  
Net finance costs
            
 
(26
) 
      (57 )       (43 ) 
             
 
 
     
 
 
     
 
 
  
Net movement in the fair value of hedges is further explained in note 16. Derivatives not in a hedge relationship include fair value movements in the interest rate and cross-currency interest rate swaps.