aha - back to estimates again....
I did one of these in my garage, lying on my back under the car. I never want to do another.. nothing was seized, but it's really tricky to get the mounts out ( and harder to get the new, taller ones in )
After that I saw alasdairs how to thread on here - dropping the steering rack and cross member. the long way but probably much quicker for the home mechanic. I wish I'd seen it first
In my opinion, a garage that does thus regularly, with the car on a lift, should do this in under 4 hours.
Find a garage with a cheap hourly rate - I wouldnt want to pay £75+vat for a job like this.