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IPO Related Expenses (Tables)
12 Months Ended
Dec. 31, 2017
Disclosure Of Initial Public Offering Related Expenses [Abstract]  
Summary of Initial Public Offering Related Expenses

 

 

 

2017

 

 

2016

 

 

2015

 

 

 

(in thousands)

 

 

 

£

 

 

£

 

 

£

 

IPO related expenses

 

 

1,794