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Intangible assets - Estimated useful life (Details)
£ in Millions
 12 Months Ended
Dec. 31, 2022
GBP (£)
Disclosure of detailed information about intangible assets  
Residual values of intangible assets £ 0
Customer lists | Minimum  
Disclosure of detailed information about intangible assets  
Estimated useful economic lives of intangible assets 3 years
Customer lists | Maximum  
Disclosure of detailed information about intangible assets  
Estimated useful economic lives of intangible assets 15 years
Other intangibles | Minimum  
Disclosure of detailed information about intangible assets  
Estimated useful economic lives of intangible assets 2 years
Other intangibles | Maximum  
Disclosure of detailed information about intangible assets  
Estimated useful economic lives of intangible assets 15 years
Product development | Minimum  
Disclosure of detailed information about intangible assets  
Estimated useful economic lives of intangible assets 2 years
Product development | Maximum  
Disclosure of detailed information about intangible assets  
Estimated useful economic lives of intangible assets 5 years
Computer software | Minimum  
Disclosure of detailed information about intangible assets  
Estimated useful economic lives of intangible assets 3 years
Computer software | Maximum  
Disclosure of detailed information about intangible assets  
Estimated useful economic lives of intangible assets 5 years