I'd expect you to be considered as a new customer / new installation. That would be subject to the standard new install fee. Exactly what fee would depend on the services you take, for example a phone/TV/Broadband bundle might offer you free installation:
http://shop.virginmedia.com/home.html
---------- Post added at 15:18 ---------- Previous post was at 15:17 ----------
Edit: Kindly don't open duplicate threads on the same matter. Your second thread has been removed.