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Share-based Payments - Disclosure of RSU activity (Details) - RSU | 12 Months Ended
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Dec. 31, 2022 shares £ / shares | Dec. 31, 2021 shares £ / shares | Dec. 31, 2020 shares £ / shares
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Outstanding (Non-vested), beginning of year (in shares) | shares | 3,632,715 | 3,422,582 | 4,636,347
Granted (in shares) | shares | 4,309,883 | 2,195,133 | 1,759,011
Vested (in shares) | shares | (696,398) | (1,176,695) | (2,781,687)
Forfeited (in shares) | shares | (1,155,420) | (808,305) | (191,089)
Outstanding (Non-vested), end of year (in shares) | shares | 6,090,780 | 3,632,715 | 3,422,582
Weighted average grant date fair value, RSU outstanding beginning balance (in GBP per share) | £ / shares | £ 1.91 | £ 2.46 | £ 2.08
Weighted average grant date fair value, RSU granted (in GBP per share) | £ / shares | 1.76 | 2.15 | 1.80
Weighted average grant date fair value, RSU vested (in GBP per share) | £ / shares | 2.80 | 2.93 | 1.54
Weighted average grant date fair value, RSU forfeited (in GBP per share) | £ / shares | 2.67 | 2.25 | 2.37
Weighted average grant date fair value, RSU Ending balance (in GBP per share) | £ / shares | £ 1.74 | £ 1.91 | £ 2.46

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- Definition The number of other equity instruments (ie other than share options) granted in a share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2022-03-24 -Paragraph 47 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2022-en-r&anchor=para_47_b&doctype=Standard -URIDate 2022-03-24 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Name IFRS -Number 2 -IssueDate 2022-03-24 -Paragraph 45 -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2022-en-r&anchor=para_45&doctype=Standard -URIDate 2022-03-24 + Details
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- Definition The number of other equity instruments (ie other than share options) exercised or vested in a share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IFRS -Number 2 -IssueDate 2022-03-24 -Paragraph 45 -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2022-en-r&anchor=para_45&doctype=Standard -URIDate 2022-03-24 + Details
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- Definition The number of other equity instruments (ie other than share options) forfeited in a share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IFRS -Number 2 -IssueDate 2022-03-24 -Paragraph 45 -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2022-en-r&anchor=para_45&doctype=Standard -URIDate 2022-03-24 + Details
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