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Commitments - Narrative (Details) - GBP (£)
£ in Millions
12 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2021
Disclosure of Commitments [Abstract]      
Capital expenditure on intangibles and property, plant and equipment £ 599 £ 399 £ 263
Minimum lease rentals payables for short term leases and leases of low-value assets 36 13 11
Total future cash outflow for leases that had not yet commenced and not recognised as lease liabilities £ 11 £ 11 £ 132