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Leases - Amounts recognised in the consolidated income statement - Narrative (Details) - GBP (£)
£ in Millions
12 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2018
Disclosure Of Quantitative Information About Leases [Line Items]      
Expenses in respect of leases of low value assets and short term leases £ 39    
Expenses in respect of variable lease payments 11    
Total cash outflow for leases £ 180    
Plant and machinery      
Disclosure Of Quantitative Information About Leases [Line Items]      
Operating lease expenses   £ 19 £ 21
Other assets (mainly properties)      
Disclosure Of Quantitative Information About Leases [Line Items]      
Operating lease expenses   £ 101 £ 87