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Share-based payments - Share options outstanding (Details)	12 Months Ended
	Dec. 31, 2021 Options £ / shares	Dec. 31, 2020 Options £ / shares
Disclosure of terms and conditions of share-based payment arrangement [line items]
Weighted average exercise price	£ 308.06	£ 143.28
Number of share options outstanding | Options	19,670	16,817
Expected weighted average remaining vesting period (years)	1 year 1 month 13 days	1 year 1 month 17 days
Number of options exercisable | Options	7,715	7,635
Maximum
Disclosure of terms and conditions of share-based payment arrangement [line items]
Exercise prices	£ 1,298.49
Minimum
Disclosure of terms and conditions of share-based payment arrangement [line items]
Exercise prices	£ 38.22

X

- Definition

Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

+ References

No definition available.

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+ References

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- Definition

The exercise price of outstanding share options.

+ References

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- Definition

The number of share options outstanding in a share-based payment arrangement.

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The weighted average exercise price of share options outstanding in a share-based payment arrangement. [Refer: Weighted average [member]]

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