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Deferred tax - Movements in net deferred tax asset (Details) - GBP (£)
3 Months Ended 6 Months Ended 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Jun. 30, 2020
Movements in net deferred tax asset          
Net deferred tax asset at beginning of period     £ (27,025,000) £ (26,550,000) £ (26,550,000)
(Credited)/expensed to the statement of profit or loss (note 10) £ (1,369,000) £ 10,428,000 (2,046,000) 10,779,000 1,426,000
Credited to other comprehensive income (note 10) 202,000 (1,476,000) (1,864,000) (325,000) (1,901,000)
Net deferred tax asset at end of period (30,935,000) (16,096,000) (30,935,000) (16,096,000) £ (27,025,000)
US          
Movements in net deferred tax asset          
Unrecognised deferred tax assets 30,282,000 22,672,000 30,282,000 22,672,000  
UK          
Movements in net deferred tax asset          
Unrecognised deferred tax assets £ 0 £ 0 £ 0 £ 0