No, you can email these details in to us in fact, if you visit this page below and fill in the form here it will go straight through to the relevant department...

http://www.justyou.co.uk/customer-support/contact-us/ 

Complete your details (including booking reference number),select "question post-booking" and then included the emergency contact details in the "Your Enquiry" box.

Kindest regards,

Julia