A woman down my road owns an old Vauxhall Astra, W reg, lost her car keys, it was the only one set she had! so whilst she was stuck, couldn't get into her car, she phoned up various locksmiths, who told her that as long as she can get someone to remove one of her door locks and bring it to them, they could make a duplicate key to fit her locks. But the trouble was how does she open her door to begin with for someone to remove her door lock and key barrel from inside the car, you have to first get inside. She was quoted a very nominal sum under £120.00 for making a new door key and a new transponder programmed to suit her car by a mobile locksmith for her immobiliser. a lot more cheaper than a dealers price.
Earlier on she had also tried Vauxhall dealers, gave them her VIN number but they wanted extortionate amount of money to supply her a new duplicate key with appropriate transponder code for her immobiliser, more than her car was worth, so one minute she was almost going to scrap her car.
Then as a few days had gone past, her car got broke into, thieves broke her rear quarter window, and managed to lift the rear passenger door locking knob lifted up to unlock the car, but to even their surprise, the doors were dead locked, and refused to open, so someone tried for her front door locking and managed to lift that up with a long contraption that reached the door lock button from the broken rear quarter window, again to no avail, the doors refused to open.
This goes to show you what dead locking means, and what its designed purpose is, many cars with dead locking are useless as when you lift the door knob through an open window they will just open, so defeating the purpose.
later on when all avenues were explored, including opening the bonnet with a long reach pole to operate her bonnet catch, disconnecting her battery and reconnecting it did nothing, she was hoping that it might reset her central locking and dead locks, but it didn't do sod all.
So in the end, the mobile locksmiths came, with their contraption they manged to open her front drivers door, and with it the dead locks retracted and got into her car, undid the inner door panel and removed the door card undid her door handle and barrel and took it away and next day they returned with a new key and a new transponder , programed it into her ignition system, and the car fired away.
But just goes to show you how some cars are tough to get into, even despite breaking a window and undoing door lock knobs, the dead locking is solid!