Non heated screens are peanuts - ring these guys, they might have a branch local to you;

http://www.yell.com/listings/DoFindL...td/Windscreens

Fitting you can do yourself - length of string and some glass cleaner in a spray bottle and you're done in 5 mins. Or if you don't fancy it, as said, a local company will do that for £30 - might even get a local fitter to do it for less as a private job...