New Hub 3 - No Internet

I had the dreaded red light on a Hub 3 so had a new Hub 3 provided by Virgin Media.  Due to work issues, I've only just been able to change the hubs over and have had major issues with the new one.  No internet connection on any device, solid white light but the green WiFi light goes off.  I've tried using the WPS button - no difference.  All the automatic checks were carried out and as the 'what lights are on' didn't have the correct configuration (i.e. solid white light with no other lights) it was concluded that an engineer is required.  No appointments for another 10 days (conveniently after the £40 fee would be charged to my account) and no way that I can be without Internet for so long as I work from home.  Therefore the old hub has been reconnected (which is working so no issues with cables, etc.).  Reading through the posts on here, it seems that it may be an activation issue - anyone have any other ideas or solutions?  Ready to start throwing things out of the window here!