No I haven't come across Peter as so far I have only followed the Kent family. There were a couple of Hadler families that came to Australia, some in the 1800's and my family in the 1970's. What is your grand father's name and a little history such as his father and mother's name palce of birth and I will see if we are related. One of my great grand father's had 13 children and he also had a few brothers and sisters. Most of the Hadler's from Kent were born around Maidstone, East Farliegh, Boughton Monchelsea, Loose and other small villages in Kent.
Look forward to hearing from you again.
I live in Western Australia.