Okay, I'll hunt around for one.
I just did the simplest test of all, connecting a working cable from the Virgin wall socket to the FAX - no extension leads, no EXT cable to phone, just a basic connection - and it failed.
I wonder, is the Virgin Blue zone already VoiP? Does VoiP work through the old connection or do you HAVE to plug the cable into the hub? If it's already VoiP, that's why the FAX won't connect.