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Financial risk management (Details)
£ in Millions, $ in Millions
12 Months Ended
Dec. 31, 2024
GBP (£)
Dec. 31, 2023
GBP (£)
Dec. 31, 2024
USD ($)
Financial risk management      
Book value £ 2,498 £ 3,153  
$50m term loan due May 2025      
Financial risk management      
Notional amount of debt | $     $ 50
$700m term loan      
Financial risk management      
Notional amount of debt | $     700
Bond debt      
Financial risk management      
Fair market value 2,480 2,959  
Book value 2,494 2,943  
Liquidity Risk      
Financial risk management      
Required headroom of unrestricted cash and available committed facilities £ 600    
Minimum period for which Treasury Committee manages financing requirements and associated headroom 12 months    
Unrestricted cash £ 357    
Combined headroom £ 1,196 1,603  
Advance period for financing debt maturities 12 months    
Liquidity Risk | Committed debt facilities      
Financial risk management      
Available commitments £ 799   1,000
Liquidity Risk | $50m term loan due May 2025      
Financial risk management      
Available commitments £ 40   50
Liquidity Risk | $700m term loan | Less than 1 year      
Financial risk management      
Notional amount of debt | $     $ 700
Liquidity Risk | €500m bond and €600m bond      
Financial risk management      
Increase in coupon payable percentage, in the event that the Group is downgraded to BB+ or below 1.25%    
Period for redemption of bonds 120 days    
Credit risk | Below A-      
Financial risk management      
Balances with banks £ 13 16  
Credit risk | Below A- | Single bank      
Financial risk management      
Balances with banks £ 1 £ 1  
Foreign exchange risk      
Financial risk management      
Foreign currencies as a percentage of Group's operating profit 112.00%    
Threshold amount of foreign currencies exposure covered by foreign exchange derivatives £ 10    
Percentage of movement in risk assumption 10.00% 10.00% 10.00%
Foreign exchange risk | US dollar      
Financial risk management      
Foreign currencies as a percentage of Group's operating profit 60.00%    
Percentage of net debt 63.00% 74.00%  
Percentage of movement in risk assumption 10.00% 10.00% 10.00%
Increase (decrease) in operating profit due to reasonably possible movement in risk assumption £ 30 £ 35  
Decrease (increase) in interest payable due to reasonably possible movement in risk assumption 10 12  
Increase (decrease) in other comprehensive income due to reasonably possible movement in risk assumption 372 349  
Increase (decrease) in other comprehensive income due to reasonably possible movement in risk assumption, offsetting impact of net investment hedging £ 158 £ 182  
Foreign exchange risk | Euro      
Financial risk management      
Foreign currencies as a percentage of Group's operating profit 33.00%    
Percentage of net debt 26.00% 28.00%  
Percentage of movement in risk assumption 10.00% 10.00% 10.00%
Increase (decrease) in operating profit due to reasonably possible movement in risk assumption £ 17 £ 16  
Decrease (increase) in interest payable due to reasonably possible movement in risk assumption 4 5  
Increase (decrease) in other comprehensive income due to reasonably possible movement in risk assumption 19 17  
Increase (decrease) in other comprehensive income due to reasonably possible movement in risk assumption, offsetting impact of net investment hedging £ 24 £ 27  
Foreign exchange risk | Other currencies      
Financial risk management      
Percentage of net debt 11.00% (2.00%)  
Interest rate risk      
Financial risk management      
Percentage of estimated future interest rate exposures (excluding pensions) to be fixed 50.00%    
Minimum period for which estimated future interest rate exposures are to be fixed 12 months    
Interest rate risk | US dollar      
Financial risk management      
Percentage of movement in risk assumption 1.00% 1.00% 1.00%
Income statement impact due to reasonably possible increase in designated risk component £ 2 £ 6  
Interest rate risk | Euro      
Financial risk management      
Percentage of movement in risk assumption 1.00% 1.00% 1.00%
Increase (decrease) in market value of the Group's bond liabilities due to reasonably possible increase in designated risk component £ (61) £ (86)  
Income statement impact due to reasonably possible increase in designated risk component £ 0 £ 0  
Interest rate risk | Pound sterling      
Financial risk management      
Percentage of movement in risk assumption 1.00% 1.00% 1.00%
Increase (decrease) in market value of the Group's bond liabilities due to reasonably possible increase in designated risk component £ (22) £ (26)  
Income statement impact due to reasonably possible increase in designated risk component £ 0 £ 0  
Interest rate risk | $700m term loan | US dollar      
Financial risk management      
Percentage of term loan hedged 37.50% 50.00%  
Interest rate risk | Bond debt      
Financial risk management      
Fair market value £ 2,480 £ 2,959  
Book value £ 2,494 £ 2,943