My youngest has just moved house and her new front door is uPVC which she has to keep locking manually from the inside, which is inconvenient. My front door is different - you can slam lock it which means it can't be opened from the outside without a key (or force) but just push the lever down inside...
So I have now read that this is a split spindle arrangement.
Would this be a reasonably straightforward retrofit for a d-i-y bodger or is it something which can only easily be done when getting a new door?
(I will suggest at best that she changes the lock to get a thumb turn cylinder on the inside which is easier and - IMO - safer than leaving keys hanging inside the door. I've done that myself before!!)
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uPVC door lock - fitting split spindle 
uPVC door lock - fitting split spindle 