Avoid Auto Elite in staffordshire. They were supposed to be a good company and I used them as they did pvw's rallye project car.
They fitted a toad a101cl to my polo, and I had all sorts of problems, not with the alarm specifically though. It was their poor workmanship like the wiring to the door solenoids broke over time, causing the c/l not to work on that side. They also made a mess of the door membranes and the holes they drilled weren't protected well.