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Share-based payments - Fair value of options granted (Details)			12 Months Ended
	Jun. 30, 2022 GBP (£) $ / shares	Jun. 10, 2021 $ / shares	Dec. 31, 2021 GBP (£)	Dec. 31, 2021 GBP (£) Y	Dec. 31, 2021 GBP (£) £ / shares	Dec. 31, 2020 GBP (£) £ / shares
Disclosure of terms and conditions of share-based payment arrangement [line items]
Weighted average fair value per option of options granted			£ 31.97	£ 31.97	£ 31.97	£ 6.70
Average share price at date of grant | £ / shares					£ 492.42	£ 40.36
Expected volatility (%)			50.00%			50.00%
Vesting period in years			4	4		1
Option life in years			4.25			4.00
Risk-free interest rate (%)			0.28%			(0.13%)
EMI share option scheme
Disclosure of terms and conditions of share-based payment arrangement [line items]
Weighted average fair value per option of options granted	£ 0.52		£ 31.97	£ 31.97	£ 31.97
Average share price at date of grant | $ / shares	£ 5.38	$ 492.42
Expected volatility (%)	50.00%	50.00%
Vesting period in years	2 years 9 months	4 years
Risk-free interest rate (%)	1.25%	0.28%

X

- Definition

The vesting period of share options at grant date

+ References

No definition available.

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- Definition

The vesting period of share options granted.

+ References

No definition available.

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- Definition

The expected volatility of the share price used to calculate the fair value of the share options granted. Expected volatility is a measure of the amount by which a price is expected to fluctuate during a period. The measure of volatility used in option pricing models is the annualised standard deviation of the continuously compounded rates of return on the share over a period of time.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 2
-IssueDate 2021-01-01
-Paragraph 47
-Subparagraph a
-Clause i
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2021-en-r&anchor=para_47_a_i&doctype=Standard
-URIDate 2021-03-24

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- Definition

The option life of share options granted.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 2
-IssueDate 2021-01-01
-Paragraph 47
-Subparagraph a
-Clause i
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2021-en-r&anchor=para_47_a_i&doctype=Standard
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- Definition

The implied yield currently available on zero-coupon government issues of the country in whose currency the exercise price for share options granted is expressed, with a remaining term equal to the expected term of the option being valued (based on the option's remaining contractual life and taking into account the effects of expected early exercise). [Refer: Government [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 2
-IssueDate 2021-01-01
-Paragraph 47
-Subparagraph a
-Clause i
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2021-en-r&anchor=para_47_a_i&doctype=Standard
-URIDate 2021-03-24

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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.

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No definition available.

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- Definition

The weighted average fair value of share options granted during the period at the measurement date. [Refer: Weighted average [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 2
-IssueDate 2021-01-01
-Paragraph 47
-Subparagraph a
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2021-en-r&anchor=para_47_a&doctype=Standard
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- Definition

The weighted average share price used as input to the option pricing model to calculate the fair value of share options granted. [Refer: Option pricing model [member]; 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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