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Deferred tax - Movements in net deferred tax asset (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
Jun. 30, 2018
Movements in net deferred tax asset          
Net deferred tax asset at beginning of period [1]     £ (34,198) £ (119,949) £ (119,949)
Expensed to the income statement £ 8,633 £ 57,921 9,974 65,334 [1] 63,519 [1]
(Credited)/expensed to other comprehensive income (1,254) 6,618 (110) 10,593 [1] 21,685 [1]
Reclassification to tax receivable       2,323 [1] 547
Net deferred tax asset at end of period £ (24,334) £ (41,699) £ (24,334) £ (41,699) [1] £ (34,198) [1]
[1] Comparative amounts have been restated - see note 34 to the interim consolidated financial statements for further details.