A bit of false advertising here:
Side-by-side, in another room, or on the go. Set entertainment free with the Virgin TV Go app and enjoy live channels, Catch Up and On Demand on your mobile or tablet wherever there’s WiFi, 3G or 4G in the UK.
http://www.virginmedia.com/shop/tv.html
Virgin TV Go includes live channels and On Demand box sets, but it does not (at least yet) include Catch Up.