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Contingent liabilities and legal proceedings - Tax (Details)
£ in Millions
Jun. 30, 2022
GBP (£)
Brazil | Maximum | Tax contingent liability  
Disclosure of contingent liabilities [line items]  
Potential liability £ 545
India  
Disclosure of contingent liabilities [line items]  
Receivable for protest payments 120
Receivable for protest payments, corporate taxes 108
Receivable for protest payments, indirect taxes 12
India | Maximum | Tax contingent liability  
Disclosure of contingent liabilities [line items]  
Potential liability £ 131