Gents: I know this is a long shot, but..... I have been thinking of how to immobilise my car without going to extreme but yet still be effective.
Now the way I see it is if you install a kill switch in the boot (On the fuel pump wire), you can push the lock mechanism to only open with a Key (the boot cannot be opened inside the car unless removal of rear seats). Therefore you will create more headaches for the theif, and if they are watching you when you get out of your car to immobilise (it just looks like your getting something outta your boot).
Only problem is that my boot keylock has been blanked out, So I cannot open it with my key.