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Share-based payments - Movements in the number of share options (Details)
£ in Thousands
6 Months Ended 12 Months Ended
Mar. 15, 2022
GBP (£)
Options
Jun. 30, 2022
GBP (£)
Options
Dec. 31, 2021
Options
EMI share option scheme      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Outstanding, start of period   19,670 16,817
Granted during the period     3,147
Grant arising due to scheme modification 23,213,933 23,213,933  
Forfeited during the period   (1,576,948) (294)
Outstanding, end of period   21,656,655 19,670
Grant raised in modified scheme | £ £ 6,545 £ 6,545  
MWC share option scheme      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Granted during the period     2,000,000