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Working capital - Analysis of expected credit loss allowance for doubtful debts (Details) - GBP (£)
£ in Millions
12 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2019
Summary Of Additional Information About Working Capital [Abstract]      
Balance at beginning of the year £ 160 £ 113 £ 97
Exchange differences (13) (3) 3
Income statement (income)/charge (15) 55 23
Written off (20) (5) (10)
Ending balance £ 112 £ 160 £ 113