I have a Jaguar XJ6 3 litre 2003 the driver door handle has jammed open and the door has remained locked. Can you offer any suggestions?

Open the door manually with the key!

Many Ford Escapes have power door locks as standard equipment. This system consists of a lock switch, lock actuator and wiring harness. When you depress the lock switch, it sends an electronic signal through the harness to the actuator. The actuator moves an internal piston that either pulls the actuator hook down or pushes it up. The actuator hook connects to the lock rod, which either locks or unlocks the door, depending on which way you push the lock button. While this system won't work with a dead battery, the mechanical lock system remains unaffected by electrical power loss.

Insert the door lock key into the driver's door lock.
Turn the key counterclockwise one quarter turn.
Pull the door handle up until the Escape's door opens. Once the driver door is open, simply open the remaining doors by pulling the interior door handles until the doors open.

I had the same problem in my 2002 not isn't back I got a tin of wd 40 put the straw applecateter in the key hole and give it a good dose after 10 minute it open did it again now it works fine so I did them soon to make shore try it before you have to pull the door panel apart

the inside of the handle break off remove it you will see it

I would confer with your Jag dealer on this one. Removing the door panel with the door closed is a real problem and they may have an easy fix without risking damaging anything. From what you say it sounds like the normal door release mechanism is not engaged but that the lock is. All I can suggest is to wind the window down and to do a combination waggling the 'half cocked' internal release handle back and forth whilst at the same time physically unlocking the door lock and/or using the central locking fob; press the door into the door jam at the same time to take pressure off the frame catch.

The cable going to must have come undone or handle leaver inside is broken. The interior door panel will have to be removed to verify problem.

check lock buttons on doors and keyfob for stuck button

You have something broke or not working inside the door. You have a huge problem. You will need to remove the door panel with it closed which is going to be hard to do. Once you can get into the inside of the door you will be able to inspect the linkage and figure what is the real problem inside. The door lock assembly will never work correctly till you find out if a clip broke and you can't know that till looking inside

If the locks are working whilst you are driving then more and likely it is the actual door lock assy that is bad. the solenoid go bad and can cause erratic operation. But unfortunately they are only available with the whole door lock/latch assy.
I would disconnect the drivers and see if the problem still exists.
JPTCAT