disco 2 immobiliser problem

I have an intermittent problem with my immobiliser on my disco 2 2004 not turning off when the car is unlocked.
local land rover dealer cant identify fault
only other prob with car is occ leak from front roof window in case relevant
help please
thanks Klaus
ps if necessar happy to disconnect the immobiliser if some one can tell me a dealer in the london area who can do it

If your roof leaks then remove and check the under dash fusebox and you will find surface tracks on the board. Should you have got it early enough then a good clean and fuse check will repair it.

ermmm, water + electrics, what can possibly go wrong