You can use any tv with a standard box but if you want to use your new tv'sHD capability you would have to upgrade to a HD box.
You have a choice of 2 boxes the VHD box
http://allyours.virginmedia.com/html/tv/v-hd-box.html or the V+ box which can record and pause live tv.
http://allyours.virginmedia.com/html...us-hd-box.html