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Dividends (Details)
12 Months Ended
Jun. 30, 2021
GBP (£)
£ / shares
Jun. 30, 2021
USD ($)
$ / shares
Jun. 30, 2020
GBP (£)
£ / shares
Jun. 30, 2020
USD ($)
$ / shares
Jun. 30, 2019
GBP (£)
£ / shares
Jun. 30, 2019
USD ($)
$ / shares
Dividends            
Dividends paid £ 10,718,000 $ 14,665,000 £ 23,229,000 $ 29,554,000 £ 23,326,000 $ 29,615,000
Dividends paid per share | (per share) £ 0.07 $ 0.09 £ 0.14 $ 0.18 £ 0.14 $ 0.18