Anyone know how this works with regard to keypad entry.
What if Billy Burglar susses that you have it firtted and beats the code out of you, can you give him a false code and he will still be able to start the car and get away from you and then have the car cut out? Dr. Clifford... any comments?

It's not a keypad as such, just a discrete little two-button affair that the code is entered into. I wouldn't worry about a carjacker sussing out such a thing has been fitted anyway. As nothing appears to happen for a short while, they'll be too high on adrenaline and too happy that the car started - or was able to be driven away - to stop and ask you whether they'll be needing any codes or suchlike in the near future.