Well, after seeing the link to the CustHelp page, I'm 99.9% convinced it's 'Avanti West Coast'. As someone else mentioned, CustHelp is hosted by Oracle. We used to use Service Cloud at my old place of work but we got rid of custhelp and replaced it with our own domain name - not everyone business seems to do it but some replace it, some just leave it.
I'm a little disappointed if that's the full and chosen name. Unless, it's simply called 'West Coast' with Avanti just being like like "Northern by Arriva". I doubt it though, given the text size and it's prominence.