I'm from Sydney, Australia but originally from Hong Kong.
I'm also tracking down the HO (何) family genealogy.
My grandmother (CHIU-Yim-King) and her entire family migrated from China to Hong Kong probably in the 1940's after WW2. Due to the mayhem of migration I assume we have lost contact with my grandfather (HO).
I'd be glad to help out, but I don't know where to start!