Which company can supply and install motorised dish?

I want to get a full motorised satallite dish with reciever that is capable of recieving all satallite channels from all over the world. Question is I carnt find a supplyer that supplys and fits them. I live in the London area and I am looking for a geniene repatable company. Has anyone on this forum had this kind of unit installed at their property? Also, what sort of price are these types of units? And what dish size should I be considering? Thanks.