v3.25.0.1
Share capital and other reserves - Ordinary shares (Details)
12 Months Ended
Dec. 23, 2024
GBP (£)
shares
Dec. 23, 2024
USD ($)
$ / shares
shares
Mar. 13, 2024
GBP (£)
shares
Mar. 13, 2024
USD ($)
shares
Dec. 31, 2024
GBP (£)
shares
Dec. 31, 2024
$ / shares
Sep. 30, 2024
GBP (£)
Jun. 30, 2024
GBP (£)
May 22, 2024
GBP (£)
shares
Dec. 31, 2023
shares
Share capital and other reserves                    
Number of shares issued | shares         47,557,591          
Proceeds received         £ 15,629,000          
Proceeds received         15,629,000          
Treasury share reserve         £ 803,000   £ 803,000 £ 803,000 £ 803,000  
Number of shares held in treasury | shares         140,000       140,000 0
Partial conversion of convertible loan notes         £ 280,605,000          
Convertible senior secured notes                    
Share capital and other reserves                    
Number of shares issued | shares         47,343,585          
Ordinary shares | shares 47,343,585 47,343,585                
Market value per share | $ / shares   $ 7.42                
Convertible senior secured notes | First half of principal amount                    
Share capital and other reserves                    
Original Debt, Amount | $   $ 130,000,000                
Conversion price (Per share price) | $ / shares   $ 2.75                
Conversion rate | shares   363.636                
Convertible senior secured notes principal amount, per instrument | $   $ 1,000                
Imagination Aero Ltd                    
Share capital and other reserves                    
Number of shares issued | shares     200,000 200,000 200,000          
Proceeds received     £ 15,629,000   £ 15,629,000          
Ordinary Share                    
Share capital and other reserves                    
Number of shares issued | shares         47,557,591          
Par Value Per Share | $ / shares           $ 0.001        
Share capital                    
Share capital and other reserves                    
Premium arising         £ 38,072          
Partial conversion of convertible loan notes         38,000          
Share capital | Convertible senior secured notes                    
Share capital and other reserves                    
Premium arising         37,817          
Share capital | Exercise of Nil-Cost Options                    
Share capital and other reserves                    
Premium arising         99          
Share capital | Imagination Aero Ltd                    
Share capital and other reserves                    
Premium arising         £ 156          
Exercise of Nil-Cost Options | Exercise of Nil-Cost Options                    
Share capital and other reserves                    
Number of shares issued | shares         14,006          
Share premium                    
Share capital and other reserves                    
Premium arising         £ 296,196,000          
Partial conversion of convertible loan notes         280,567,000          
Share premium | Convertible senior secured notes                    
Share capital and other reserves                    
Premium arising £ 280,567,000       280,567,000          
Share premium | Imagination Aero Ltd                    
Share capital and other reserves                    
Premium arising     £ 15,629,000 $ 20,000,000 £ 15,629,000