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Income tax expense - Additional information related to tax (Details) - GBP (£)
£ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Jun. 30, 2019
Income tax expense          
Current tax £ (529) £ (1,453) £ (932) £ (959)  
Deferred tax (note 18) 1,476 1,254 325 110 £ 634
Total income tax credit/(expense) recognized in other comprehensive income £ 947 £ (199) £ (607) £ (849)