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Income tax expense - Additional information related to tax (Details) - GBP (£)
1 Months Ended 12 Months Ended
Apr. 30, 2023
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2019
Income tax related to recognition in other comprehensive income        
Deferred tax (note 17)   £ 1,448,000 £ 1,901,000 £ 634,000
Current tax   (2,017,000) (1,799,000) (1,900,000)
Total income tax (expense)/credit recognized in other comprehensive income   (569,000) 102,000 (1,266,000)
US        
Income tax related to recognition in other comprehensive income        
Deferred tax (note 17)   £ 3,395,000 £ 422,000 £ (2,208,000)
Tax rate   21.00% 21.00% 21.00%
Non-cash deferred tax charge   £ 66,561,000 £ 3,916,000  
UK        
Income tax related to recognition in other comprehensive income        
Deferred tax (note 17)   £ (1,947,000) 1,479,000 £ 2,842,000
Tax rate 25.00% 19.00%    
Non-cash deferred tax charge   £ 11,224,000 £ 3,915,000