I went to school with Blagraves in Brantford Ontario. Their Father and grandfather were Osteopaths in Bromley Kent. I don't remember their names, but he had a brother Peter.
The childrens names were Carole, John, Christopher, Susan, and Kathy. As the graduated they each returned to England. Either John or Christopher are in the UK phonebook for London and area. Or at least they were a number of years back. If I remember the name of the street where they lived I'll get back to you. I visited Carole in 1977 and again in December 1978, I lost contact with them a few months later. Hope this helps.