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Equity - Schedule of monthly breakdown of shares purchased and the average price paid per share (Details) - Treasury shares purchased during the year - £ / shares | 1 Months Ended | 12 Months Ended
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Jun. 30, 2022 | May 31, 2022 | Apr. 30, 2022 | Mar. 31, 2022 | Feb. 28, 2022 | Jan. 31, 2022 | Dec. 31, 2021 | Nov. 30, 2021 | Oct. 31, 2021 | Sep. 30, 2021 | Aug. 31, 2021 | Jul. 31, 2021 | Jun. 30, 2022
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Average price paid pence (in GBP per share) | £ 35.84 | £ 37.24 | £ 39.35 | £ 35.88 | £ 37.14 | £ 37.97 | £ 39.60 | £ 37.85 | £ 35.50 | £ 34.93 | £ 35.38 | £ 34.57 | £ 37.08
Authorised purchases unutilised at month end (in shares) | 179,417,463 | 186,188,868 | 198,816,572 | 206,077,136 | 214,557,872 | 220,423,582 | 226,246,325 | 230,669,356 | 232,045,302 | 222,186,588 | 225,362,524 | 227,758,747 | 179,417,463
Share buyback programme |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares purchased under share buyback programme (in shares) | 6,771,405 | 12,627,704 | 7,260,564 | 8,480,736 | 5,865,710 | 5,822,743 | 4,423,031 | 1,375,946 | 1,565,980 | 3,175,936 | 2,396,223 | 1,728,254 | 61,494,232
Total number of shares purchased (in shares) | 6,771,405 | 12,627,704 | 7,260,564 | 8,480,736 | 5,865,710 | 5,822,743 | 4,423,031 | 1,375,946 | 1,565,980 | 3,175,936 | 2,396,223 | 1,728,254 | 61,494,232

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- Definition The number of share purchases authorised but not yet utilised at month-end. + References No definition available. + Details
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- Definition Purchase Of Treasury Shares, Shares + References No definition available. + Details
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- Definition Weighted Average Share Price Per Share + References No definition available. + Details
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- Definition The increase (decrease) in the number of shares outstanding. [Refer: Number of shares outstanding] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2021-01-01 -Paragraph 79 -Subparagraph a -Clause iv -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_79_a_iv&doctype=Standard -URIDate 2021-03-24 + Details
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- Details
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- Details
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