Unfortunatly i dont operate that far south, but seeing the demand i may be revising my area....
for a decent reliable signal, and reception of bbc2,3, and 4, a 1.8m dish should be approx 700€ - installed.
you can get a decent freetoair reciver for 100€ - about he same price for the basic freesat receiver.
a sky receiver will be approx 225€
you get LNB's (the bit of electronics that sits on the end of the dish) for one, two or four connections (single, twin or quad). any more, then you will require a multiswitch unit and quatro LNB, which allows connections of 8 or 12 or more...good incase you want a PVR like sky+ or the soon to be released freesat hd pvr. costs for the quatro, multiswitch and seperate connection will be determined by how many connections are required and how long and how much work would be required for these connetions.
hope this helps..