First up

to Mazdarotaryclub.com
I only know of three more over here other than my own car plus two poorly ones in Ireland,
"allegedly" my one is the only one in active use ATM and even the Europeans think the same out there
It could well be that as my one is a Series 1 with its original 12A engine that it could be the oldest UK car left.
When I got the car some 14 years ago I went out on Aus Rotary and told them what I had as they had loads of these cars, to be told "blimey mate even we haven't got any stock Series 1 cars left!"