OK no worries, I've called CS but I've been on hold for longer than I can bear so I don't mind waiting someone to reply here. There's no immediate rush, I have a 20m Cat5 running up the stairs into a switch in the room temporarily.
If any Virgin Media staff come across this, please PM me.
@tony, that's a good shout actually but I don't have the kit or the confidence in my ability to do a good job of that. By the time I've bought the right drill, the drill bit, the cable (I assume Virgin Media provide the cable) and large enough ladder, all of which I'd use once, I've spent more than £99.