singalg - I got the name of my lock in the color selection schedule under External Door Furniture.
Search :- LANE MORTISE PLUS 2 x 600MM BACK TO BACK BAR HANDLE COMBO INCLUDING SNIB LOCK
That is External and Internal view with Knob .
Your may be different but you will know the specs if you find out the name of the product and search!
I have the same model listed in my colours. I'm sure there is a knob on our door to allow you to lock it from the inside without a key.