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Assets and liabilities held for sale - Narrative (Details) - GBP (£)
£ in Millions
Sep. 30, 2022
Jul. 14, 2022
Guinness Cameroon S.A.    
Disclosure Of Assets and Liabilities Held For Sale [Line Items]    
Consideration received   £ 389
USL Popular brand    
Disclosure Of Assets and Liabilities Held For Sale [Line Items]    
Consideration received £ 87  
Gain on disposal of assets held for sale £ 4