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Finance income (Details) - GBP (£)
£ in Millions
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Finance income.      
Bank interest received £ 36 £ 25 £ 5
Fair value gain on hedge ineffectiveness 3 1 22
Foreign exchange gain on translation of foreign assets/liabilities   11  
Hyperinflation accounting adjustment 7 11 22
Total finance income £ 46 £ 48 £ 49