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Taxation - Components of corporate tax expense (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Taxation |  |  |
Current tax on result | $ 249 | $ 139 | $ 61
Deferred tax prior years |  | 18 |
Deferred tax current year | (7,264) | (9,679) | (3,921)
Movement in valuation allowance | 7,264 | 9,679 | 3,903
Total corporate tax | $ 249 | $ 157 | $ 43

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