In the uk this type of dish will be hard to find as they arent popular enough, so you would likely have to import it from Europe.
1.8m Polar mount Dish will cost about 500 euros, plus transport cage about 350, plus delivery about 400-ish, and actuator/v-box cost at about 150 euros.
Some Dish examples here- _http://www.demon-multimedia.com/productos/productos.asp?ids=4
But not sure if they arrange delivery to uk?
I would expect allow about 1500 euros total should cover imported dish cost, actuator, positioner. You may need to do lots work to arrange though, unless you find a uk dealer but then you'd pay above 2000 euros.