The setpal box is a free to air digital TERRESTRIAL receiver, also known as FTA (free to air) and Freeview.  Depending where you are you may get the Spanish digital channels on it (I'm fairly sure the digital standard has been adopted throughout Europe, unlike the analogue standards). You'll need a conventional TV aerial pointing in the right direction to receive the channels.  You won't get anything in English though, except when they broadcast films in dual language and English is one of them!

For UK channels you have 2 choices, SKY or Freesat. Both use the same cluster of satellites at 28.8E and for decent reception you'll need a 1.2 meter dish.

If what you want is UK tv channels in all rooms you will have to have a satellite system. You have a few options;
1. Use a multiple output LNB on your satellite dish and run a cable to a Freesat receiver in each room. This lets each receiver tune to its own channel and you can watch what you want in each room.
2. Get a video transmitter and receiver(s) and plug it into your Sky box. You can have as many receivers as you want - and they're wireless so no cables. Everyone will then be watching the same channel.
3. Cable, in coaxial cable, from the main box to each room and plug the TV's into the cable - you may need an amplifier to boost the signal.  Again, all tv's will see the same program.

The channels on freesat are pretty much as WoO says and you can find a list of them in many places on the internet.

Nigel