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Equity - Schedule of allotted and fully paid share capital (Details) - GBP (£) £ in Millions, shares in Millions | Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2020
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Disclosure of reserves within equity [abstract] |  |  |
Number of shares (in shares) | 2,498 | 2,559 | 2,562
Nominal value | £ 723 | £ 741 | £ 742

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