I don't think there was any (or much) testing back then and I don't think they were interested, it seemed to be a question of you were 'type 1' if you were very young, or 'type 2'or 'type 2 on insulin'. I remember them telling my Mum, 'anything over 30 ish and it's type 2' and that is how it stayed for many years. Even now they seem to think along those lines. No wonder all the subsequent surveys said 'type 2' was a condition that got worse, I'm sure it did when people were constantly misdiagnosed. No chance to go into remission as a type 2 (once on insulin, always on insulin).