It has been a few years since our paths crossed. I'm glad to see your still interested in all this. I had lost hope so long ago, and figured that I might as well wait a few years for the internet to catch on.
Back around 92-94 I emailed you about an Edward Herdman that had passed away in New Zealand. That was the first time I had an idea of possible other siblings to my Grandfather Wilson Herdman. It appears you are trying to locate the next generation back. If I can help from here I'd be most willing.
A couple of years ago I sent for the info from Newington Cemetery and found out that Thomas, His wife Mary A.Herdman, and it appears two younger Herdman's are buried there. All in the same plot
My Genealogy research has sent me searchung on my wife's side of the family as there is loads of info out there. Also when her familys' ancestors came to Canada, they settled within 50 KM of where we are. Then they moved out to Manitoba.
If you have collected more, I would be pleased to share back and forth.