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Operating costs - Other external charges (Details) - GBP (£) £ in Millions | 12 Months Ended
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Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2020
Analysis of income and expense [abstract] |  |  |
Research and development expenditure | £ 43 | £ 40 | £ 34
Maintenance and repairs expense | £ 136 | £ 107 | £ 105

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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. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2021-01-01 -Paragraph 85 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_85&doctype=Standard -URIDate 2021-03-24 + Details
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- Definition The amount of expenditure directly attributable to research or development activities, recognised in profit or loss. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 38 -IssueDate 2021-01-01 -Paragraph 126 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=38&code=ifrs-tx-2021-en-r&anchor=para_126&doctype=Standard -URIDate 2021-03-24 + Details
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