As long as you have a dual or quad LNB on your dish, and can wire up another sky box, get hold of a Sky Freestat viewing card and away you go.
If you already have the cabling in then it's even easier.
http://www.freesatfromsky.co.uk/
If you don't have a spare Sky box, try ebay, I got a replacement box from ebay when mine went "pop", much cheaper than getting one from Sky