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Share-based Payments - Disclosure of weighted average exercise prices for options exercised (Details)
 12 Months Ended
Dec. 31, 2022
shares
£ / shares
Dec. 31, 2022
shares
$ / shares
Dec. 31, 2021
shares
£ / shares
Dec. 31, 2020
shares
£ / shares
Weighted Average Options exercisable [Line Items]        
Number of share options exercised (in dollars per share) | shares 577,022 577,022 2,238,187 514,410
Weighted average exercise price (in dollars per share) | £ / shares £ 0.50   £ 0.70 £ 1.52
Vedanta        
Weighted Average Options exercisable [Line Items]        
Number of share options exercised (in dollars per share) 400,000 400,000 52,938 813
Weighted average exercise price (in dollars per share) | $ / shares   $ 0.02