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Equity - Allotted and fully paid share capital (Details) - GBP (£) £ in Millions, shares in Millions	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2019
Disclosure of reserves within equity [abstract]
Number of shares (in shares)	2,559	2,562	2,601
Nominal value	£ 741	£ 742	£ 753

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The nominal value of capital issued.

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The number of shares issued by the entity, for which full payment has been received.

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