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Dividends (Details)
6 Months Ended
Jan. 07, 2022
GBP (£)
Jan. 07, 2022
USD ($)
$ / shares
Dec. 31, 2021
GBP (£)
Dec. 31, 2021
USD ($)
$ / shares
Jun. 30, 2021
GBP (£)
Dec. 31, 2020
GBP (£)
Dividends            
Dividends paid     £ 10,669,000 $ 14,669,000 £ 10,718,000 £ 0
Dividends paid per share       $ 0.09    
Dividends proposed or declared before financial statements authorised for issue but not recognised as distribution to owners £ 10,893,000 $ 14,670,000        
Dividends proposed or declared before financial statements authorised for issue but not recognised as distribution to owners per share   $ 0.09