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Dividends (Details)				6 Months Ended
	Jun. 05, 2019 $ / shares	Jan. 04, 2019 USD ($) $ / shares	Jan. 04, 2019 GBP (£)	Dec. 31, 2018 GBP (£)	Jun. 30, 2018 GBP (£)	Dec. 31, 2017 GBP (£)
Disclosure of classes of share capital
Dividends paid | £				£ 0	£ 21,982,000	£ 0
Dividends paid before financial statements authorised for issue but not recognised as distribution to owners		$ 14,807,000	£ 11,610,000
Dividends paid before financial statements authorised for issue but not recognised as distribution to owners per share		$ 0.09
Forecast
Disclosure of classes of share capital
Dividends paid per share	$ 0.09

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