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Deferred tax - Analysis of the deferred tax (Details) - GBP (£)
£ in Thousands
Dec. 31, 2022
Jun. 30, 2022
Dec. 31, 2021
Jun. 30, 2021
Analysis of deferred tax        
Net deferred tax liability £ (2,413) £ (7,402) £ (30,422) £ (35,546)