Why not just e-mail them and ask to reconfirm your booking and ticketing?
[email protected]
Or you can contact them at London STN
Mobile: + 44 (0) 75 258 258 56
E-mail: [email]
[email protected][/e-mail]
These are the e-mails and phone number I got from their website under "contacts".
Is your ticket issued on 9U's stock?