In reply to Dominicandave:
What you've got coming is a freeview / on-demand box. It will need an aerial to get live TV and a connection to your router to use the on-demand features. The box is a YouView variant, so you'll get the free on demand services (like iPlayer, 4OD, ITV player) and the subscription services (you have to pay extra) like Netflix.
The router needs to be near the TV box or connected by cable, no WiFi on these YouView boxes. The easiest thing is to buy Powerline adapters. You plug one in by the router and one in by the TV.
BT used to give these away for free with their equivalent service. TalkTalk might too if you explain.
If you have no aerial, and don't want catch up services on your TV (only your PC), then don't bother with this service and get a Freesat box to use with your dish and then just use your router to watch catch up on your laptop.