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Share-based Payments - Disclosure of weighted average exercise prices for options exercisable (Details) | Dec. 31, 2022 shares £ / shares | Dec. 31, 2022 shares $ / shares | Dec. 31, 2021 shares £ / shares | Dec. 31, 2020 shares £ / shares
--- | --- | --- | --- | ---
Weighted Average Options exercisable [Line Items] |  |  |  |
Number of options (in shares) | shares | 6,185,216 | 6,185,216 | 4,773,873 | 5,447,405
Weighted average exercise price (in dollars per share) | £ / shares | £ 2.03 |  | £ 1.42 | £ 0.98
Entrega |  |  |  |
Weighted Average Options exercisable [Line Items] |  |  |  |
Number of options (in shares) | 344,500 | 344,500 |  |
Weighted average exercise price (in dollars per share) |  | $ 1.91 |  |
Entrega | Bottom of range |  |  |  |
Weighted Average Options exercisable [Line Items] |  |  |  |
Exercise price range (in dollars per share) |  | 0.02 |  |
Entrega | Top of range |  |  |  |
Weighted Average Options exercisable [Line Items] |  |  |  |
Exercise price range (in dollars per share) |  | $ 2.36 |  |
Follica |  |  |  |
Weighted Average Options exercisable [Line Items] |  |  |  |
Number of options (in shares) | 2,776,120 | 2,776,120 |  |
Weighted average exercise price (in dollars per share) |  | $ 1.41 |  |
Follica | Bottom of range |  |  |  |
Weighted Average Options exercisable [Line Items] |  |  |  |
Exercise price range (in dollars per share) |  | 0.03 |  |
Follica | Top of range |  |  |  |
Weighted Average Options exercisable [Line Items] |  |  |  |
Exercise price range (in dollars per share) |  | $ 1.86 |  |
Vedanta |  |  |  |
Weighted Average Options exercisable [Line Items] |  |  |  |
Number of options (in shares) | 1,824,576 | 1,824,576 |  |
Weighted average exercise price (in dollars per share) |  | $ 15.89 |  |
Vedanta | Bottom of range |  |  |  |
Weighted Average Options exercisable [Line Items] |  |  |  |
Exercise price range (in dollars per share) |  | 0.02 |  |
Vedanta | Top of range |  |  |  |
Weighted Average Options exercisable [Line Items] |  |  |  |
Exercise price range (in dollars per share) |  | $ 21.35 |  |

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- Definition The exercise price of outstanding share options. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2022-03-24 -Paragraph 45 -Subparagraph d -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2022-en-r&anchor=para_45_d&doctype=Standard -URIDate 2022-03-24 + Details
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- Definition The number of share options exercisable 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 45 -Subparagraph b -Clause vii -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2022-en-r&anchor=para_45_b_vii&doctype=Standard -URIDate 2022-03-24 + Details
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- Definition The weighted average exercise price of share options exercisable 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 vii -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2022-en-r&anchor=para_45_b_vii&doctype=Standard -URIDate 2022-03-24 + Details
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