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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
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

Disclosure of average monthly borrowings and effective interest rate.

+ References

No definition available.

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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
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- Definition

The interest rate on borrowings. [Refer: Borrowings]

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