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Dividends (Details)
12 Months Ended
Jun. 30, 2023
GBP (£)
£ / shares
Jun. 30, 2023
USD ($)
$ / shares
Jun. 30, 2022
GBP (£)
£ / shares
Jun. 30, 2022
USD ($)
$ / shares
Jun. 30, 2021
GBP (£)
£ / shares
Jun. 30, 2021
USD ($)
$ / shares
Dividends            
Dividends paid £ 0 $ 0 £ 33,553,000 $ 44,010,000 £ 10,718,000 $ 14,665,000
Dividends paid per share | (per share) £ 0 $ 0 £ 0.2 $ 0.27 £ 0.07 $ 0.09