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Operating costs - Other external charges (Details) - GBP (£) £ in Millions	12 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2019
Analysis of income and expense [abstract]
Research and development expenditure	£ 40	£ 34	£ 35
Maintenance and repairs expense	£ 107	£ 105	£ 103

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- References

No definition available.

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

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