This ones easy find the fuse for the standard alarm/immobiliser and simpley remove it, you will notice the red light on the dash now will not flash when the car is locked, also when you start the car this light will come on and stay lit for afew seconds.
But if you have lost the key and you car'nt get to the fuses or into YOUR car lol Then these steps will get you off and running but will caues minimal damage, First use a screwdriver and pop the black plastic cover off the doorlock then stick your screwdriver in the center of the lock and rive it side to side and up and down to lousen the lock itself, you may here the car unlock as you do this but dont open the door as then horn will start ringing, once you have made the lock louse put the screwdriver at the side of the lock so the screwdriver oneside at the lock and the other side at the door panel and push to the to the side so the lock pops inside the door, you will now have a big hole in the door were your lock was put your fingers inside and feel upwards for a thick wire this has other wires inside it once you have found this wire simply cut into it and and make sure the wires inside touch and short this will pop the fuse, if you did this right you will notice the red light next to the clock will have stoped flashing and presto the immobiliser is now dead also so is ford standerd alarm, now put your finger back in the lock and feel downwards you should feel a bit of plastic this will move up and down this will unlock and lock the car depending on which way you push it and thats it, this works on all ford fiesta/escourt/orion/mondeo in the years of J reg upto an L after that its slitley diffrent to remove immobiliser if anyone has mor questions mail me at LS12crew@hotmail.co.uk hope i was of help
PAUL LEEDS 12/28, June 2008