TV Go Android app - 'sorry we can't play this at the moment 0'

I am using a brand new Android Tablet with the latest Android release (v16) and have installed the TV Go App - I am able to log onto my account and when selecting any channel, the request to register the device appears, as soon as I select register, I then get the following error:

Not Available - Sorry we can't play this at the moment 0

I have tried clearing cache, even deleting and re-installing the app. I am also able to successfully watch when accessing Virgin TV Go via Chrome on the same device, so it's just via the TV Go app that it doesn't work.

Any advice?