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Financial instruments and risk management - Schedule of movements in level 3 instruments measured on a recurring basis (Details) - Level 3 - GBP (£)
£ in Millions
 12 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Disclosure of fair value measurement of liabilities [line items]    
At the beginning of the year £ (587)  
At the end of the year (529) £ (587)
Zacapa financial liability    
Disclosure of fair value measurement of liabilities [line items]    
At the beginning of the year (216) (149)
Net (losses)/gains included in the income statement (8) (20)
Net gains/(losses) included in exchange in other comprehensive income 9 (26)
Net losses included in retained earnings (16) (34)
Acquisitions 0 0
Settlement of liabilities 13 13
At the end of the year (218) (216)
Contingent consideration payable    
Disclosure of fair value measurement of liabilities [line items]    
At the beginning of the year (371) (429)
Net (losses)/gains included in the income statement 117 62
Net gains/(losses) included in exchange in other comprehensive income 11 (39)
Net losses included in retained earnings 0 0
Acquisitions (76) (70)
Settlement of liabilities 8 105
At the end of the year £ (311) £ (371)