As I'm the guy who fitted a cruise control in about 20mins, I guess I should answer Nicks comment....
There are different types of cruise control for different years of car, the later models (my 97 2.0 lpt uses this type, I think the change is from about 1995) have an electronic system that cosists of just a control box with a cable that pulls the actuator on the throttle body, a new indicator stalk, two electric switches for the pedals, and a short wiring harness to connect the pedal switches to the main wiring loom.
Fitting this type of cruise control is easy and quick, you just have to make sure you have the little wiring harness for the switches as it doesn't come in the main kit. I agree that fitting the vacuum system sounds a lot harder, and may take the two hours Neo Bros wanted.
I asked Two Stroke to Turbo in Hatfield about a cruise control for my car around two years ago, and they gave me a £200 for bits + 2 hours labour estimate to fit one I think. Whereas the dealer gave me a written quote with a much higher price for the kit and 0.2 hours for fitting which came to about the same money. At that price I thought I could live without one, and I did untill I got a "sell-out" kit from another dealer and fitted it myself.
I think how simple this job is depends on what car you are fitting it to, and I wonder if the Neo bros/Two Stroke guys actually do fit the older vacuum system to the newer cars as I guess they will have more stock of the vacuum systems than the electronic ones.
-Gareth-