Thanks for your reply hd3. I've taken the door card off already, but I can't see a way of undoing the lock from the inside :{

Can anybody help? When unlocked, engine running or not, window drops the 20mm or so as usual, I hear a clicking from the solenoid (or nearby) but the door won't unlock. The solenoid (tailgate locking motor?) clicks with a straight 12V from the battery, but no joy. From other threads, it seems...