One minute late
Now, the service doesn't seem to have changed at all since they've taken only, though that's mainly because they're suing exactly the same staff and rolling stock as Great Eastern and Anglia were using before, but I've noticed one problem with the name. My local station, and I think most of the stations in this area (and probably the country) have an automated announcement system which makes announcements of the sort:
The next train from Platform x is the xx:xx (train company) service to (destination)
Which doesn't cause any problems until you have a train going at 20, 30, 40 or 50 minutes past the hour when it becomes, as it was last night:
The next train from Platform 3 is the 20:20 One service to London Liverpool Street which, of course, actually sounds like: the 20:21 service to London Liverpool Street.
Admittedly, it's just a minor quibble, but might cause some embarrassing moments for passengers and station staff when people miss trains by a minute or so. But then, I doubt the marketing consultants - who were probably paid a ridiculously large sum of money to come up with the name - ever travel by train with us plebs, so what do they care?