Martin,
I used Magma in Bathgate to do mine. Wasnt there when they done the car, but i'm fairly confident they DIDNT take the windows out, and the job is perfect. No bubbles at all. Think they charged £50 per window though.
The law states:
Section 32 of the Road Vehicles (Construction and Use) Regulations have been amended to include "Window Tint Films" where such materials attached to the glass are capable of reducing the Visible Light Transmission of forward windows to below prescribed levels (70% VLT for windows forward of the 'B' pillar)
Basically, i dont think your allowed to put ANY film on the front side windows. A 'friend' got pulled last year and I (erm, i mean HE) got told his front windows were illegal but fortuntely they were only handing out advice that night.