ok this is a little breezy ill edit it later and be more precise when my dads home
get you mucky mits on a left hand tap
step 1 drill a small hole in the bolt
step 2 screw in the left hand tap
step 3 screw it in and it shud pull the bolt out
I have done this a few times
you can get them from b&q for more infomation ask at b&q