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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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Oct. 06, 2022 | Jun. 30, 2023 | May 31, 2023 | Apr. 30, 2023 | Mar. 31, 2023 | Feb. 28, 2023 | Jan. 31, 2023 | Dec. 31, 2022 | Nov. 30, 2022 | Oct. 31, 2022 | Sep. 30, 2022 | Aug. 31, 2022 | Jul. 31, 2022 | Jun. 30, 2023
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Average price paid pence (in GBP per share) | £ 37.02 | £ 33.48 | £ 35.34 | £ 36.72 | £ 35.41 | £ 35.77 | £ 35.58 | £ 37.10 | £ 36.79 | £ 0 | £ 37.44 | £ 38.20 | £ 35.67 | £ 36.17
Authorised purchases unutilised at month end (in shares) | 173,704,983 | 196,247,438 | 196,658,000 | 201,854,558 | 204,738,508 | 209,092,285 | 210,811,162 | 218,801,077 | 223,373,000 | 227,870,414 | 173,836,847 | 176,110,073 | 177,756,956 | 196,247,438
Share buyback programme |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares purchased under share buyback programme (in shares) | 131,864 | 410,562 | 5,196,558 | 2,883,950 | 4,353,777 | 1,718,877 | 7,989,915 | 4,571,923 | 4,497,414 | 0 | 2,273,226 | 1,646,883 | 1,660,507 | 37,335,456
Total number of shares purchased (in shares) | 131,864 | 410,562 | 5,196,558 | 2,883,950 | 4,353,777 | 1,718,877 | 7,989,915 | 4,571,923 | 4,497,414 | 0 | 2,273,226 | 1,646,883 | 1,660,507 | 37,335,456

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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 2022-03-24 -Paragraph 79 -Subparagraph a -Clause iv -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2022-en-r&anchor=para_79_a_iv&doctype=Standard -URIDate 2022-03-24 + Details
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- Details
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- Details
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