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Commitments - Narrative (Details) - GBP (£)
£ in Millions
12 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2020
Disclosure of Commitments [Abstract]      
Capital expenditure on intangibles and property, plant and equipment £ 399 £ 263 £ 312
Minimum lease rentals payables for short term leases and leases of low-value assets 13 11 19
Total future cash outflow for leases that had not yet commenced and not recognised as lease liabilities £ 11 £ 132 £ 133