Hi Fiona,
I won't bother you again but I had to say a couple of things.

One is that the Diane that I mentioned is the granddaughter of Charles Poyser Henstock.She is the daughter of his son Francis.So..you were originally looking for cousins...she would be a cousin.
She also mentioned on that site that she knew her grandfather Charles had a brother Phillip.
So,your grandfather Phillip and her grandfather Charles Poyser are brothers so you definitely are cousins.

Seeing she was Francis' daughter and if he stayed on Vancouver Island (haven't checked the B.C.Archives site for deaths)then perhaps she is still in British Columbia and by her user name still living on Vancouver Island.

So,you have found some descendents that you mentioned wanting to find in your first post here.
Good luck to you.
Elaine