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Financial instruments and risk management - Schedule of average monthly net borrowings and effective interest rate (Details) - GBP (£) £ in Millions | Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2021
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Disclosure of average monthly borrowings and effective interest rate [line items] |  |  |
Average monthly net borrowings | £ 15,541 | £ 14,137 | £ 12,109
Effective interest rate | 3.90% | 2.70% | 2.70%
Weighted average |  |  |
Disclosure of average monthly borrowings and effective interest rate [line items] |  |  |
Average monthly net borrowings | £ 15,244 | £ 12,692 | £ 12,702

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- Definition The amount of outstanding funds that the entity is obligated to repay. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2022-03-24 -Paragraph 55 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2022-en-r&anchor=para_55&doctype=Standard -URIDate 2022-03-24 + Details
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