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Income tax expense - Additional information related to tax (Details) - GBP (£)
£ in Thousands
 12 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2018
Income tax related to recognition in other comprehensive income      
Deferred tax (note 17) £ 1,901 £ 634 £ (21,684)
Current tax (1,799) (1,900)  
Total income tax credit/(expense) recognized in other comprehensive income 102 (1,266) (21,684)
US      
Income tax related to recognition in other comprehensive income      
Deferred tax (note 17) 422 [1] (2,208) [1] (17,494)
UK      
Income tax related to recognition in other comprehensive income      
Deferred tax (note 17) £ 1,479 [2] £ 2,842 [2] £ (4,190)
[1] The full deferred tax asset balance is expected to be recovered after more than one year.
[2] Of the total deferred tax liability, £29,131,000 is expected to be settled after more than one year.