I may be able to help re the miniature. My 87 yr old mother said that she saw it 2- 3 years ago during a visit to a distant relative.
My mother comes from the Wilbraham & Caroline Liardet line via their son Frank.
I remember seeing a necklace that was meant to have been given to Perpetue at the home of some Liardets who lived in Mildura in about 1960.
I also was lucky to find original photos of Caroline, Wilbraham and others hidden between the leaves of an album purported to having belonged to Leonora. Enough to send tingles down my spine - it was as though they had been waiting to be found! This was during a visit to Ballam Park, the house that Wilbraham helped build in Frankston.
It's certainly an interesting family line my mother's christian name is Evelyn - a family to be proud of.