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Consolidated Statement of Changes in Equity - Analysis of Other Reserves (Parenthetical) - GBP (£)
£ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2005
Dec. 31, 2004
Consolidated Statement of Changes in Equity          
Net gain/(loss) on cash flow hedge [1] £ 27 £ 3 £ (6)    
Gain (loss) from effective portion of changes in fair value (51) (28) 137    
Amount of reclassification to the cost of acquisition 0 0 (118)    
Amount of reclassification due to changes in foreign exchange rates £ 78 £ 31 £ (25)    
Nominal value per share £ 0.01     £ 0.01 £ 1
[1] £27m net gain (2023: £3m net gain; 2022: £6m net loss) on cash flow hedge includes a £51m loss (2023: £28m loss; 2022: £137m gain) from the effective portion of changes in fair value, offset by reclassification to the cost of acquisition of £nil (2023: £nil; 2022: £118m loss) and a £78m gain (2023: £31m gain; 2022: £25m loss) reclassification to the income statement due to changes in foreign exchange rates.