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Dividends (Details)
6 Months Ended
Jan. 07, 2021
USD ($)
$ / shares
Jan. 07, 2021
GBP (£)
Dec. 31, 2020
GBP (£)
Jun. 30, 2020
GBP (£)
Dec. 31, 2019
GBP (£)
Dividends          
Dividends paid | £     £ 0 £ 23,229,000 £ 0
Dividends paid before financial statements authorised for issue but not recognised as distribution to owners $ 14,665,000 £ 10,718,000      
Dividends paid before financial statements authorised for issue but not recognised as distribution to owners per share | $ / shares $ 0.09