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Commitments - Narrative (Details) - GBP (£) £ in Millions	12 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2019
Disclosure of Commitments [Abstract]
Capital expenditure on intangibles and property, plant and equipment	£ 263	£ 312	£ 255
Minimum lease rentals payables for sort-term leases and leases of low-value assets	11	19
Total future cash outflow for leases that has not yet commenced and not recognised as lease liabilities	£ 132	£ 133

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- Definition

Disclosure of commitments.

+ References

No definition available.

+ Details

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- Definition

Lease Commitments For Short-term and Low-value Leases For Which Recognition Exemption Has Been Used

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No definition available.

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- Definition

Potential Exposure To Future Cash Outflow Arising From leases not yet commenced and not recognised as lease liabilities

+ References

No definition available.

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- Definition

The amount of future capital expenditures that the entity is committed to make.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2020-01-01
-Paragraph 112
-Subparagraph c
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-URIDate 2020-01-01

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