Financial instruments - risk management (Details 1) - GBP (£) £ in Thousands |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2025 |
Dec. 31, 2024 |
Dec. 31, 2023 |
|
| IfrsStatementLineItems [Line Items] | |||
| Equity settled derivative financial liability | £ 2,915 | £ 383 | £ 4,160 |
| Level 3 of fair value hierarchy [member] | Black-Scholes option pricing model [member] | |||
| IfrsStatementLineItems [Line Items] | |||
| Equity settled derivative financial liability | £ 2,914 | ||
| Valuation technique (s) and key input(s) | Black-Scholes Model | Black-ScholesModel | |
| Significant unobservable input(s) | Volatility rate of 110.0% determined using historical volatility of comparable companies. | Volatility rate of 75.0% 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. | |
| Significant unobservable input(s) | Expected life between a range of 0.1 and 4.97 years determined using the remaining life of the warrant. | Expected life between a range of 0.1 and 0.51 years determined using the remaining life of the warrant. | |
| Relationship of unobservable inputs to fair value | The shorter the expected life the lower the fair value. | The shorter the expected life the lower the fair value. | |
| Significant unobservable input(s) | Risk-free rate of 3.73% determined using the expected life assumptions. | Risk-free rate of 4.24% determined using the expected life assumptions. | |
| Relationship of unobservable inputs to 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 one [member] | |||
| IfrsStatementLineItems [Line Items] | |||
| Equity settled derivative financial liability | £ 1 | £ 231 | |
| Valuation technique (s) and key input(s) | Black-Scholes Model | Black-Scholes Model | |
| Significant unobservable input(s) | Volatility rate of 115.0% determined using historical volatility of comparable companies. | Volatility rate of 100.0% 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. | |
| Significant unobservable input(s) | Expected life between a range of 0.1 and 3.56 years determined using the remaining life of the warrant. | Expected life between a range of 0.1 and 4.56 years determined using the remaining life of the warrant. | |
| Relationship of unobservable inputs to fair value | The shorter the expected life the lower the fair value. | The shorter the expected life the lower the fair value. | |
| Significant unobservable input(s) | Risk-free rate of 3.60% determined using the expected life assumptions. | Risk-free rate of 4.36% determined using the expected life assumptions. | |
| Relationship of unobservable inputs to 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 two [member] | |||
| IfrsStatementLineItems [Line Items] | |||
| Equity settled derivative financial liability | £ 124 | ||
| Valuation technique (s) and key input(s) | Black-Scholes Model | Black-Scholes Model | Black-Scholes Model |
| Significant unobservable input(s) | Volatility rate of 115.0% determined using historical volatility of comparable companies. | Volatility rate of 75.0% determined using historical volatility of comparable companies. | Volatility rate of 95.0% 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. |
| Significant unobservable input(s) | Expected life between a range of 0.1 and 3.39 years determined using the remaining life of the warrant. | Expected life between a range of 0.1 and 0.39 years determined using the remaining life of the warrant. | Expected life between a range of 0.1 and 4.40 years determined using the remaining life of the share options. |
| Relationship of unobservable inputs to 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. |
| Significant unobservable input(s) | Risk-free rate of 3.59% determined using the expected life assumptions. | Risk-free rate of 4.29% determined using the expected life assumptions. | Risk-free rate of 3.93% determined using the expected life assumptions. |
| Relationship of unobservable inputs to 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. |
| Level 3 of fair value hierarchy [member] | Black-Scholes option pricing model three [member] | |||
| IfrsStatementLineItems [Line Items] | |||
| Equity settled derivative financial liability | £ 102 | ||
| Valuation technique (s) and key input(s) | Black-Scholes Model | Black-Scholes Model | Black-Scholes Model |
| Significant unobservable input(s) | Volatility rate of 115.0% determined using historical volatility of comparable companies. | Volatility rate of 105.0% determined using historical volatility of comparable companies. | Volatility rate of 100.0% 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. |
| Significant unobservable input(s) | Expected life between a range of 0.1 and 2.98 years determined using the remaining life of the warrant. | Expected life between a range of 0.1 and 4.39 years determined using the remaining life of the warrant. | Expected life between a range of 0.1 and 1.88 years determined using the remaining life of the warrant. |
| Relationship of unobservable inputs to 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. |
| Significant unobservable input(s) | Risk-free rate of 3.55% determined using the expected life assumptions. | Risk-free rate of 4.35% determined using the expected life assumptions. | Risk-free rate of 4.23% determined using the expected life assumptions. |
| Relationship of unobservable inputs to 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. |
| Level 3 of fair value hierarchy [member] | Black-Scholes option pricing model four [member] | |||
| IfrsStatementLineItems [Line Items] | |||
| Equity settled derivative financial liability | £ 47 | ||
| Valuation technique (s) and key input(s) | Black-Scholes Model | Black-Scholes Model | Black-Scholes Model |
| Significant unobservable input(s) | Volatility rate of 120.0% determined using historical volatility of comparable companies. | Volatility rate of 105.0% determined using historical volatility of comparable companies. | Volatility rate of 100.0% 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. |
| Significant unobservable input(s) | Expected life between a range of 0.1 and 2.47 years determined using the remaining life of the share options. | Expected life between a range of 0.1 and 3.98 years determined using the remaining life of the warrant. | Expected life between a range of 0.1 and 1.50 years determined using the remaining life of the warrant. |
| Relationship of unobservable inputs to 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. |
| Significant unobservable input(s) | Risk-free rate of 3.51% determined using the expected life assumptions. | Risk-free rate of 4.32% determined using the expected life assumptions. | Risk-free rate of 4.51% determined using the expected life assumptions. |
| Relationship of unobservable inputs to 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. |
| Level 3 of fair value hierarchy [member] | Black-Scholes option pricing model five [member] | |||
| IfrsStatementLineItems [Line Items] | |||
| Equity settled derivative financial liability | £ 2 | ||
| Valuation technique (s) and key input(s) | Black-Scholes Model | ||
| Significant unobservable input(s) | Volatility rate of 110.0% determined using historical volatility of comparable companies. | ||
| Relationship of unobservable inputs to fair value | The higher the volatility the higher the fair value. | ||
| Significant unobservable input(s) | Expected life between a range of 0.1 and 3.47 years determined using the remaining life of the share options. | ||
| Relationship of unobservable inputs to fair value | The shorter the expected life the lower the fair value. | ||
| Significant unobservable input(s) | Risk-free rate of 4.30% determined using the expected life assumptions. | ||
| Relationship of unobservable inputs to 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 six [member] | |||
| IfrsStatementLineItems [Line Items] | |||
| Equity settled derivative financial liability | |||
| Valuation technique (s) and key input(s) | Black-Scholes Model | ||
| Significant unobservable input(s) | Volatility rate of 100.0% determined using historical volatility of comparable companies. | ||
| Relationship of unobservable inputs to fair value | The higher the volatility the higher the fair value. | ||
| Significant unobservable input(s) | Expected life between a range of 0.1 and 0.89 years determined using the remaining life of the warrant. | ||
| Relationship of unobservable inputs to fair value | The shorter the expected life the lower the fair value. | ||
| Significant unobservable input(s) | Risk-free rate of 4.18% determined using the expected life assumptions. | ||
| Relationship of unobservable inputs to 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 seven [member] | |||
| IfrsStatementLineItems [Line Items] | |||
| Equity settled derivative financial liability | |||
| Valuation technique (s) and key input(s) | Black-Scholes Model | ||
| Significant unobservable input(s) | Volatility rate of 80.0% determined using historical volatility of comparable companies. | ||
| Relationship of unobservable inputs to fair value | The higher the volatility the higher the fair value. | ||
| Significant unobservable input(s) | Expected life between a range of 0.1 and 0.48 years determined using the remaining life of the warrant. | ||
| Relationship of unobservable inputs to fair value | The shorter the expected life the lower the fair value. | ||
| Significant unobservable input(s) | Risk-free rate of 4.24% determined using the expected life assumptions. | ||
| Relationship of unobservable inputs to fair value | The higher the risk-free rate the higher the fair value. | ||
| Level 3 of fair value hierarchy [member] | Monte Carlo simulation model [member] | |||
| IfrsStatementLineItems [Line Items] | |||
| Equity settled derivative financial liability | £ 2,592 | ||
| Valuation technique (s) and key input(s) | Black-Scholes Model | ||
| Significant unobservable input(s) | Volatility rate of 90.0% determined using historical volatility of comparable companies. | ||
| Relationship of unobservable inputs to fair value | The higher the volatility the higher the fair value. | ||
| Significant unobservable input(s) | Expected life between a range of 0.1 and 0.98 years determined using the remaining life of the warrant. | ||
| Relationship of unobservable inputs to fair value | The shorter the expected life the lower the fair value. | ||
| Significant unobservable input(s) | Risk-free rate of 4.79% determined using the expected life assumptions. | ||
| Relationship of unobservable inputs to fair value | The higher the risk-free rate the higher the fair value. | ||
| Level 3 of fair value hierarchy [member] | Monte Carlo simulation model one [member] | |||
| IfrsStatementLineItems [Line Items] | |||
| Equity settled derivative financial liability | £ 1,444 | ||
| Valuation technique (s) and key input(s) | Black-Scholes Model | ||
| Significant unobservable input(s) | Volatility rate of 95.0% determined using historical volatility of comparable companies. | ||
| Relationship of unobservable inputs to fair value | The higher the volatility the higher the fair value. | ||
| Significant unobservable input(s) | Expected life between a range of 0.1 and 4.98 years determined using the remaining life of the warrant. | ||
| Relationship of unobservable inputs to fair value | The shorter the expected life the lower the fair value. | ||
| Significant unobservable input(s) | Risk-free rate of 3.84% determined using the expected life assumptions. | ||
| Relationship of unobservable inputs to fair value | The higher the risk-free rate the higher the fair value. | ||