Any such thing as a self locking mortice lock?
Situation is - got an existing mortice lock on a front door to flat. Only way of locking door is by putting in key and turning it. There is no night latch / normal barrol lock on door. For reasons don't really need to explain but can't fit add anything more to existing door or drill new holes into it. Just want to change the mortice lock to one that will automatically lock when the door closes and can be opened easily from the inside, using say a thumb turn but needs a key on the outside of flat to re-open door.
Make sense?