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Capital and financial risk management - Offsetting of financial assets and liabilities (Details) - GBP (£)
£ in Millions
Dec. 31, 2024
Dec. 31, 2023
Derivative financial liabilities    
Financial instruments held at fair value by fair value hierarchy    
Gross financial Liabilities £ (160) £ (190)
Net financial liabilities per balance sheet (160) (190)
Related amounts not offset against assets 90 68
Net amount, Liabilities (70) (122)
Derivative financial assets    
Financial instruments held at fair value by fair value hierarchy    
Gross financial assets 130 88
Net financial assets per balance sheet 130 88
Related amounts not offset against liabilities (90) (68)
Net amount, Assets £ 40 £ 20