You will still need to keep your Sky viewing card. If you stop subscribing on a Sky contract, you can keep using that card to watch 5USA, 5* and PICK TV, the so-called "free-to-view" channels. (All ITV channels are free-to-air).
We recently move in new home which already has Skydish & wires with two outputs in the living room. My TV has has free sat built in but unable to plug this cables in. Do I need to buy a free sat box to start watching free TV.
Sydney: If both outputs in the living room are intended for Sky or Freesat use, then they will be of the short threaded stub variety, the jumper leads that connect into same being screwed into the stub.
If indeed your TV is capable of Freesat reception, then it will be equipped with a connection exactly the same as your outlet points, if though as I suspect, it doesn't, then you will have to purchase either a Freesat box, or more sensibly (albeit more expensive) a twin tuner Freesat PVR (recorder).
By the way, you cannot use outlets intended for satellite use into a Freeview device, as Freeview requires a normal aerial.