Hi, you may have to remove the drivers door panel and remove the barrel, At one time the drivers door + the boot lock had the serial Nos on but it is the time to remove the lock, are you Mech minded? if so I would remove the front doos card as I have advised and take it from there, as you say you think the other part of the key is in the drivers door so you or someone will have to remove it to get the bit out it is no use trying a magnet as the key is not metal. there is another way that was used years ago get a tennis ball cut a hole in it the size of a 50p put the hole over the barrel of the lock and smack it with the palm of your hand this way the barrel will be blown out. Good Luck.