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Income tax credit/(expense) - Additional information related to tax (Details) - GBP (£)
1 Months Ended 12 Months Ended
Apr. 30, 2023
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2020
Income tax related to recognition in other comprehensive income        
Deferred tax (Note 17)   £ (1,287,000) £ 1,448,000 £ 1,901,000
Current tax     (2,017,000) (1,799,000)
Total income tax (expense)/credit recognized in other comprehensive income   £ (1,287,000) (569,000) 102,000
US        
Income tax related to recognition in other comprehensive income        
Deferred tax (Note 17)     £ 3,395,000 £ 422,000
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)   £ (1,287,000) £ (1,947,000) 1,479,000
Tax rate 25.00% 19.00% 19.00%  
Non-cash deferred tax charge     £ 11,224,000 £ 3,915,000