garrardrj Did VW ever tell you how they got the door open? I have exactly the same problem on my passenger door of my 3 door Mk5 GTi. I've tried the trick with the pick and doesn't seem to have worked. I've got no electrics on the passenger side at all (central locking, window), even if you try from the drivers side controls or the key, so I'm pretty confident it's a motor like yourself or the wiring loom. There is something also draining my battery so I'm hoping it's all linked together.
If I can just get this door open I can look!