Income taxes (Tables)

3 Months Ended

Apr. 30, 2018

Disclosure Of Income Tax [Abstract]

Disclosure of income tax credits

	Three months ended April 30, 2018		Three months ended April 30, 2017
	£000s		£000s
Current period research and development tax credit receivable on qualifying expenditure	1,036		1,218
Tax expense related to the US operations	(90	)	(15	)
Total credit for the period	946		1,203