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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

X

- 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

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X

- 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

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X

- 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
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-URIDate 2022-03-24

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- Definition

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+ References

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