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Operating costs - Other external charges (Details) - GBP (£) £ in Millions	12 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2021
Analysis of income and expense [abstract]
Research and development expenditure	£ 53	£ 43	£ 40
Maintenance and repairs expense	£ 143	£ 136	£ 107

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- References

No definition available.

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- Definition

The amount of expenses incurred for the day-to-day servicing of assets, which may include the cost of labour, consumables or small parts.

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition

The amount of expenditure directly attributable to research or development activities, recognised in profit or loss.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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