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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, 2020
Dec. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Jun. 30, 2020
Income tax expense          
Current tax £ 35 £ (529) £ (2,074) £ (932)  
Deferred tax (note 17) (202) 1,476 1,864 325 £ 1,901
Total income tax (expense)/credit recognized in other comprehensive income £ (167) £ 947 £ (210) £ (607)