I'm a little puzzled by this, as, when I was growing up here in the UK, all I knew about was that most people had "Yale" locks. No key needed on the inside, only when entering from the outside. The Yale lock locked the door instantly once you closed the door, whether closing it while standing inside or outside (meaning you had better always check you had your keys when you left the house!!)
You never needed to turn a key to lock it, either from outside or in, but you needed a key to unlock it from the outside. If you were stepping outside just for a moment -- to get the paper/milk etc, you could push a little trip on the side that prevented the lock from locking even if the door closed all the way.
Yale locks were basically almost universal in the UK I used to know, and they were convenient as no manual locking with keys was required -- I'm surprised to hear of these key-requiring locks on this thread now. Goes to show a lot has changed.