hi all. I have been reading the posts about leaks through windows and doors, and have a question. Some have said to adjust the allan bolt to pull in the door on the hinge, but my problem is the lock side. My front door, a upvc one is so draughty it is like it is open. We have a portch, with the internal door on it just a internal door, but the hall is ice cold due the the front door. We are looking to replace it, and have another door internal to stop draugh, but is there another way to stop it?