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Tax expense - Additional information related to tax (Details) - GBP (£)
£ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
[1]
Dec. 31, 2018
Dec. 31, 2017
[1]
Jun. 30, 2018
[1]
Tax expense          
Current tax £ (1,453)   £ (959)    
Deferred tax (note 25) 1,254 £ (6,618) 110 £ (10,593) £ (21,685)
Total tax (expense)/credit recognized in other comprehensive income £ (199) £ (6,618) £ (849) £ (10,593)  
[1] Comparative amounts have been restated - see note 34 to the interim consolidated financial statements for further details.