Have a look at this site, which tells you how to set up a satellite system for caravan use around Europe.
http://homepage.ntlworld.com/de.sullivan/
I think basically to get english TV you'll probably need a 1.2m dish and a Sky box with a valid card. Get someone to bring or post a card to you because Sky won't let you have them registered to a foreign address.
(Having said that I believe "cards" are available locally )

Thank you so much for that link, Colin, it is EXACTLY what we have been looking for.