Jools, What Nigel says about dishes is obviously spot on (he know's a thing or two).  As to the programme content, you can watch all the mainstream channels from UK on the Freesat bundle with a straightforward digital receiver box including some HD content if required with an HD box but you won't get the actual SKY channels (premiums like films and SKY Sports) without a suitable receiver and card.  There are various ways to obtain this setup.  Your best bet is probably to ask Nigel if he'll set you up with whatever system level you decide on.