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Share-based payments - Movements in the weighted average exercise price of share options (Details) - EMI share option scheme - £ / shares	6 Months Ended	12 Months Ended
	Jun. 30, 2022	Dec. 31, 2021
Disclosure of terms and conditions of share-based payment arrangement [line items]
Weighted average exercise price, options outstanding, start of period	£ 308.06	£ 143.28
Weighted average exercise price, options granted during the period		1,178.94
Weighted average exercise price, options grant arising due to scheme modification	0.23
Weighted average exercise price, options forfeited during the period	0.83	204.00
Weighted average exercise price, options outstanding, end of period	£ 0.19	£ 308.06

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- Definition

The weighted average exercise price of share options grant arising due to scheme modification in a share-based payment arrangement

+ References

No definition available.

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- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table.

+ References

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- Definition

The weighted average exercise price of share options forfeited 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 2021-01-01
-Paragraph 45
-Subparagraph b
-Clause iii
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- Definition

The weighted average exercise price of share options granted 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 2021-01-01
-Paragraph 45
-Subparagraph b
-Clause ii
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2021-en-r&anchor=para_45_b_ii&doctype=Standard
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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
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-Number 2
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