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Related party transactions - Transactions between associates and joint ventures (Details) - GBP (£)
£ in Millions
12 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2021
Income statement items      
Sales £ 10 £ 11 £ 8
Purchases 13 31 23
Balance sheet items      
Group payables 2 2 5
Group receivables 1 2 1
Loans payable 0 0 9
Loans receivable 197 175 108
Cash flow items      
Loans and equity contributions, net £ 93 £ 66 £ 38