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Revenue recognition and operating segments - Other segment items included in the consolidated income statement (Details) - GBP (£)
£ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Disclosure of operating segments      
Amortisation and impairment of intangible assets, Total £ 199 £ 175 £ 118
Amortisation and impairment of intangible assets, Tax effect (43) (44) (25)
Amortisation and impairment of intangible assets, Total after tax effect 156 131 93
Operating segments | North America      
Disclosure of operating segments      
Amortisation and impairment of intangible assets, Total 114 118 59
Operating segments | International      
Disclosure of operating segments      
Amortisation and impairment of intangible assets, Total 75 49 53
Operating segments | Europe      
Disclosure of operating segments      
Amortisation and impairment of intangible assets, Total 39 24 29
Operating segments | UK & Sub-Saharan Africa      
Disclosure of operating segments      
Amortisation and impairment of intangible assets, Total 6 8  
Operating segments | Asia & MENAT      
Disclosure of operating segments      
Amortisation and impairment of intangible assets, Total 22 11 20
Operating segments | Pacific      
Disclosure of operating segments      
Amortisation and impairment of intangible assets, Total 8 6 4
Central and regional overheads      
Disclosure of operating segments      
Amortisation and impairment of intangible assets, Total £ 10 £ 8 £ 6