Hi Aaron, many thanks. Yes, I'm in touch with Diane, she's a cousin (I think) - she's my mum's aunty's grand daughter! I met up with her over the internet late last year and will be meeting her in April.
But I still don't know if Foxworthy House has a connection with the Foxworthy family. I intend going to Devon in May to make some enquiries - I'll report back if I find anything.
I've also stumbled across some more relations - Shirley from Canada, who knows quite a lot about the Foxworthy's that came across to Canada from Devon.