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Financial instruments - Additional Information (Details) £ in Thousands |  | 12 Months Ended
--- | --- | ---
Dec. 16, 2021 GBP (£) | Dec. 31, 2021 $ / shares | Dec. 31, 2021 GBP (£) | Dec. 31, 2020 GBP (£)
Disclosure of financial liabilities [line items] |  |  |  |
Total interest expense for financial liabilities not held at fair value through profit or loss |  |  | £ 747 | £ 801
Exercise price | $ / shares |  | $ 18 |  |
Risk-free interest rate (%) |  |  | 0.28% | (0.13%)
Expected volatility (%) |  |  | 50.00% | 50.00%
Convertible note and warrants |  |  |  |
Disclosure of financial liabilities [line items] |  |  |  |
Estimated fair value | £ 141,981 |  |  |
Percentage of discount for face value | 4.00% |  |  |
Debt discount face amount | £ 151,000 |  |  |
Fair value of debt issuance price | 145,000 |  |  |
Convertible note |  |  |  |
Disclosure of financial liabilities [line items] |  |  |  |
Fair value of convertible note estimated | £ 141,981 |  | £ 112,799 |
Exercise price | $ / shares |  | $ 6.73 |  |
Risk-free interest rate (%) |  |  | 1.25% |
Expected volatility (%) |  |  | 52.50% |
Credit spread | 2,179 |  | 2,179 |
Dividend yield |  |  | 0.00% |

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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 + Details
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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 + Details
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- Definition The exercise price 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 -URIDate 2021-03-24 + Details
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