Financial risk management and impairment of financial assets - Liquidity risk (Details) - GBP (£) £ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Financial risk management and impairment of financial assets
Financial liabilities	£ 119,350	£ 138,592
Less than one year
Financial risk management and impairment of financial assets
Financial liabilities	12,324	16,547
Between 2 and 5 years
Financial risk management and impairment of financial assets
Financial liabilities	106,371	121,271
More than 5 years
Financial risk management and impairment of financial assets
Financial liabilities	655	774
Trade and other payables
Financial risk management and impairment of financial assets
Financial liabilities	15,581	20,184
Trade and other payables \| Less than one year
Financial risk management and impairment of financial assets
Financial liabilities	11,648	16,031
Trade and other payables \| Between 2 and 5 years
Financial risk management and impairment of financial assets
Financial liabilities	3,933	4,153
Lease liabilities
Financial risk management and impairment of financial assets
Financial liabilities	2,935	3,161
Lease liabilities \| Less than one year
Financial risk management and impairment of financial assets
Financial liabilities	676	516
Lease liabilities \| Between 2 and 5 years
Financial risk management and impairment of financial assets
Financial liabilities	1,604	1,871
Lease liabilities \| More than 5 years
Financial risk management and impairment of financial assets
Financial liabilities	655	774
Convertible Senior Secured Notes
Financial risk management and impairment of financial assets
Financial liabilities	100,834	115,247
Convertible Senior Secured Notes \| Between 2 and 5 years
Financial risk management and impairment of financial assets
Financial liabilities	£ 100,834	£ 115,247

- Definition

The amount of liabilities that are: (a) a contractual obligation: (i) to deliver cash or another financial asset to another entity; or (ii) to exchange financial assets or financial liabilities with another entity under conditions that are potentially unfavourable to the entity; or (b) a contract that will, or may be, settled in the entity’s own equity instruments and is: (i) a non-derivative for which the entity is, or may be, obliged to deliver a variable number of the entity’s own equity instruments; or (ii) a derivative that will, or may be, settled other than by the exchange of a fixed amount of cash or another financial asset for a fixed number of the entity’s own equity instruments. For this purpose, rights, options or warrants to acquire a fixed number of the entity’s own equity instruments for a fixed amount of any currency are equity instruments if the entity offers the rights, options or warrants pro rata to all of its existing owners of the same class of its own non-derivative equity instruments. Also, for those purposes the entity’s own equity instruments do not include puttable financial instruments that are classified as equity instruments in accordance with paragraphs 16A-16B of IAS 32, instruments that impose on the entity an obligation to deliver to another party a pro rata share of the net assets of the entity only on liquidation and are classified as equity instruments in accordance with paragraphs 16C-16D of IAS 32, or instruments that are contracts for the future receipt or delivery of the entity’s own equity instruments. As an exception, an instrument that meets the definition of a financial liability is classified as an equity instrument if it has all the features and meets the conditions in paragraphs 16A-16B or paragraphs 16C-16D of IAS 32. [Refer: Financial instruments, class [member]; Financial assets; Derivatives [member]]

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