Derivative financial liability - current (Details 3) - GBP (£) £ in Thousands | 6 Months Ended | 12 Months Ended | | |
Jun. 30, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Jun. 30, 2022 | Dec. 31, 2019 |
IfrsStatementLineItems [Line Items] | | | | | | |
Equity settled financial derivative liability | £ 364 | £ 85 | £ 553 | £ 1,559 | £ 85 | £ 664 |
Level 3 of fair value hierarchy [member] | | | | | | |
IfrsStatementLineItems [Line Items] | | | | | | |
Equity settled financial derivative liability | 364 | 85 | | | | |
Level 3 of fair value hierarchy [member] | Black-Scholes option pricing model [member] | | | | | | |
IfrsStatementLineItems [Line Items] | | | | | | |
Equity settled financial derivative liability | £ 364 | | | | | |
Significant unobservable input(s) | | | Volatility rate of 85.0% determined using historical volatility of comparable companies. | Volatility rate of 105.0% determined using historical volatility of comparable companies. | | |
Relationship of unobservable inputs to fair value | The shorter the expected life the lower the fair value. | | The higher the volatility the higher the fair value. | The higher the volatility the higher the fair value. | | |
Description of inputs used in fair value measurement | | | Expected life between a range of 0.10 and 0.9 years determined using the remaining life of the share options. | Expected life between a range of 1.0 and 1.9 years determined using the remaining life of the share options. | | |
Description of inputs used in fair value measurement | Expected life of 4.98 years determined using the remaining life of the share options. | | | | | |
Description of inputs used in fair value measurement assets | Risk-free rate of 4.13% determined using the expected life assumptions. | | Risk-free rate of 0.71% determined using the expected life assumptions. | Risk-free rate of 0.8% determined using the expected life assumptions. | | |
Description of reasons for fair value measurement | The higher the risk-free rate the higher the fair value. | | | | | |
Valuation technique (s) and key input(s) | | | Black-Scholes option pricing model | Black-Scholes option pricing model | | |
Description of reasons for fair value measurement assets | | | The shorter the expected life the lower the fair value. | The shorter the expected life the lower the fair value. | | |
Description of reasons for fair value measurement | | | The higher the risk-free rate the higher the fair value. | The higher the risk-free rate the higher the fair value. | | |
Level 3 of fair value hierarchy [member] | Black Scholes Option Pricing Model One [Member] | | | | | | |
IfrsStatementLineItems [Line Items] | | | | | | |
Equity settled financial derivative liability | | 48 | | | | |
Significant unobservable input(s) | 2023 - Black-Scholes Model | | | | | |
Relationship of unobservable inputs to fair value | Volatility rate of 90% determined using historical volatility of comparable companies. | | | | | |
Description of inputs used in fair value measurement | The higher the volatility the higher the fair value. | | | | | |
Level 3 of fair value hierarchy [member] | Black Scholes Option Pricing Model Two [Member] | | | | | | |
IfrsStatementLineItems [Line Items] | | | | | | |
Equity settled financial derivative liability | | £ 37 | | | | |
Significant unobservable input(s) | 2023 – Black- Scholes Model | | | | | |
Relationship of unobservable inputs to fair value | Volatility rate of 90% determined using historical volatility of comparable companies. | | | | | |
Description of inputs used in fair value measurement | The higher the volatility the higher the fair value. | | | | | |
Level 3 of fair value hierarchy [member] | Monte Carlo simulation model [member] | | | | | | |
IfrsStatementLineItems [Line Items] | | | | | | |
Equity settled financial derivative liability | | | | £ 1,187 | | |
Significant unobservable input(s) | 2022 - Monte Carlo simulation model | Volatility rate of 70.0% determined using historical volatility of comparable companies. | Volatility rate of 95.0% determined using historical volatility of comparable companies. | Volatility rate of 105.0% determined using historical volatility of comparable companies. | | |
Relationship of unobservable inputs to fair value | The shorter the expected life the lower the fair value. | The higher the volatility the higher the fair value. | The higher the volatility the higher the fair value. | The higher the volatility the higher the fair value. | | |
Description of inputs used in fair value measurement | | Expected life between a range of 0.1 and 2.88 years determined using the remaining life of the share options. | Expected life between a range of 0.1 and 3.88 years determined using the remaining life of the share options. | Expected life between a range of 0.1 and 4.49 years determined using the remaining life of the share options. | | |
Description of inputs used in fair value measurement | Expected life between a range of 0.1 and 2.38 years determined using the remaining life of the share options | | | | | |
Description of inputs used in fair value measurement assets | Risk-free rate of 4.68% determined using the expected life assumptions. | Risk-free rate of 4.22% determined using the expected life assumptions. | Risk-free rate of 0.31% determined using the expected life assumptions. | Risk-free rate of 0.07% determined using the expected life assumptions. | | |
Description of reasons for fair value measurement | The higher the risk-free rate the higher the fair value. | | | | | |
Valuation technique (s) and key input(s) | | Monte Carlo simulation model | Monte Carlo simulation model | Monte Carlo simulation model | | |
Description of reasons for fair value measurement assets | | The shorter the expected life the lower the fair value. | The shorter the expected life the lower the fair value. | The shorter the expected life the lower the fair value. | | |
Description of reasons for fair value measurement | | The higher the risk-free rate the higher the fair value. | The higher the risk-free rate the higher the fair value. | The higher the risk-free rate the higher the fair value. | | |
Level 3 of fair value hierarchy [member] | Black Scholes Option Pricing Model Three [Member] | | | | | | |
IfrsStatementLineItems [Line Items] | | | | | | |
Significant unobservable input(s) | 2023 – Black- Scholes Model | | | | | |
Relationship of unobservable inputs to fair value | Volatility rate of 90% determined using historical volatility of comparable companies. | | | | | |
Description of inputs used in fair value measurement | The higher the volatility the higher the fair value. | | | | | |
Level 3 of fair value hierarchy [member] | Number of shares lapsed [Default Label] | | | | | | |
IfrsStatementLineItems [Line Items] | | | | | | |
Significant unobservable input(s) | | Volatility rate of 70.0% determined using historical volatility of comparable companies. | Volatility rate of 85.0% determined using historical volatility of comparable companies | Volatility rate of 105.0% determined using historical volatility of comparable companies | | |
Relationship of unobservable inputs to fair value | | The higher the volatility the higher the fair value. | The higher the volatility the higher the fair value. | The higher the volatility the higher the fair value. | | |
Description of inputs used in fair value measurement | Expected life between a range of 0.1 and 2.00 years determined using the remaining life of the share options. | Expected life between a range of 0.1 and 2.5 years determined using the remaining life of the share options. | Expected life between a range of 0.1 and 3.5 years determined using the remaining life of the share options. | Expected life between a range of 0.1 and 4.888 years determined using the remaining life of the share options. | | |
Description of inputs used in fair value measurement assets | Risk-free rate of 4.87% determined using the expected life assumptions. | Risk-free rate of 4.32% determined using the expected life assumptions. | Risk-free rate of 0.71% determined using the expected life assumptions. | Risk-free rate of 0.08% determined using the expected life assumptions. | | |
Valuation technique (s) and key input(s) | 2022 - Monte Carlo simulation model | Monte Carlo simulation model | Monte Carlo simulation model | Monte Carlo simulation model | | |
Description of reasons for fair value measurement assets | The shorter the expected life the lower the fair value. | The shorter the expected life the lower the fair value. | The shorter the expected life the lower the fair value. | The shorter the expected life the lower the fair value. | | |
Description of reasons for fair value measurement | The higher the risk-free rate the higher the fair value. | The higher the risk-free rate the higher the fair value. | The higher the risk-free rate the higher the fair value. | The higher the risk-free rate the higher the fair value. | | |