Thanks to all who have tried to help with ideas. I think we are getting closer to a solution but can anyone help with this next question. I have a strong sense there is a component causing a volt drop. I am sure it's part of the anti theft system. Going back years, when the battery was reconnected or changed there was a chirp from somewhere under the bonnet but I never knew where but in the region of the power distribution module perhaps. Lately this has changed to a cluck and then yesterday was silent. The alarm sounder doesn't sound. If I could locate the sounder I would try isolating it electrically. I am thinking this aledged volt drop is stopping the door module from Working as its all associated with the anti theft system. Does this make sense?