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Tax expense - Additional information related to tax (Details) - GBP (£)
£ in Thousands
12 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2016
Income tax related to recognition in other comprehensive income      
Current tax   £ 16,251 £ 1,466
Deferred tax £ (21,892) (16,932)  
Total tax (expense)/credit recognized in other comprehensive income (21,892) (681) 20,307
US      
Income tax related to recognition in other comprehensive income      
Deferred tax (17,620) (1,764) 10,660
UK      
Income tax related to recognition in other comprehensive income      
Deferred tax £ (4,272) £ (15,168) £ 8,181