For that with no 'previous' plumbing I was quoted up to £250 !!!!
I nearly fell over. Apparantely can take a while.
Basically though you can do it yourself if you or A Nother is handy. You need a sort of link device for the cold filler and a waste tube thingy.
That was beyond me. I eventually got a plumber to do mine as an add on to another job he was doing. But it already had the plumbing and I did half of it myself (he spent most of the time mumbling that it probably wasn't do-able)