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Share-based Payments - Disclosure of weighted average exercise prices for options outstanding (Details) | 12 Months Ended |
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Dec. 31, 2022 shares £ / shares | Dec. 31, 2021 shares £ / shares | Dec. 31, 2020 shares £ / shares | Dec. 31, 2019 shares £ / shares | Dec. 31, 2022 shares $ / shares
Weighted Average Options Outstanding [Line Items] |  |  |  |  |
Number of share options (in shares) | 17,793,881 | 13,414,118 | 10,916,086 | 8,472,827 | 17,793,881
Weighted-average exercise price (in dollars per share) | £ / shares | £ 2.31 | £ 2.58 | £ 1.81 | £ 1.16 |
Weighted average remaining contractual life of outstanding share options (in years) | 8 years 10 days | 8 years 3 months 14 days | 8 years 4 months 17 days | 8 years 6 months 18 days |
Alivio |  |  |  |  |
Weighted Average Options Outstanding [Line Items] |  |  |  |  |
Number of share options (in shares) |  | 0 | 3,888,168 | 3,698,244 |
Entrega |  |  |  |  |
Weighted Average Options Outstanding [Line Items] |  |  |  |  |
Number of share options (in shares) | 344,500 | 349,500 | 962,000 | 972,000 | 344,500
Weighted-average exercise price (in dollars per share) | $ / shares |  |  |  |  | $ 1.91
Weighted average remaining contractual life of outstanding share options (in years) | 4 years 11 months 1 day |  |  |  |
Follica |  |  |  |  |
Weighted Average Options Outstanding [Line Items] |  |  |  |  |
Number of share options (in shares) | 2,776,120 | 2,686,120 | 1,309,040 | 1,309,040 | 2,776,120
Weighted-average exercise price (in dollars per share) | $ / shares |  |  |  |  | $ 1.41
Weighted average remaining contractual life of outstanding share options (in years) | 6 years 4 months 17 days |  |  |  |
Sonde |  |  |  |  |
Weighted Average Options Outstanding [Line Items] |  |  |  |  |
Number of share options (in shares) | 0 | 2,049,004 | 2,192,834 | 1,829,004 | 0
Vedanta |  |  |  |  |
Weighted Average Options Outstanding [Line Items] |  |  |  |  |
Number of share options (in shares) | 1,824,576 | 1,991,637 | 1,741,888 | 1,450,100 | 1,824,576
Weighted-average exercise price (in dollars per share) | $ / shares |  |  |  |  | $ 15.89
Weighted average remaining contractual life of outstanding share options (in years) | 6 years 10 months 17 days |  |  |  |

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- Definition The weighted average exercise price of share options outstanding in a share-based payment arrangement. [Refer: Weighted average [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2022-03-24 -Paragraph 45 -Subparagraph b -Clause i -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2022-en-r&anchor=para_45_b_i&doctype=Standard -URIDate 2022-03-24 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2022-03-24 -Paragraph 45 -Subparagraph b -Clause vi -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2022-en-r&anchor=para_45_b_vi&doctype=Standard -URIDate 2022-03-24 + Details
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