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Share-based payments - Movements in the weighted average exercise price of share options (Details) - £ / shares	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Share-based payments
Weighted average exercise price, options outstanding, start of period	£ 143.28
Granted during the period	1,178.94	£ 143.28
Forfeited during the period	204.00
Weighted average exercise price, options outstanding, end of period	£ 308.06	£ 143.28

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- References

No definition available.

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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
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-IssueDate 2021-01-01
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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
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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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