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Related party transactions - Transactions between associates and joint ventures (Details) - GBP (£)
£ in Millions
12 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2018
Income statement items      
Sales £ 9 £ 9 £ 10
Purchases 29 28 29
Balance sheet items      
Group payables 2 12 3
Group receivables 1 2 2
Loans payable 6 6 6
Loans receivable 82 55 59
Cash flow items      
Loans and equity contributions, net £ 47 £ 32 £ 37