Hi Grant,
Im away this month so cant help you im afraid. But, I would suggest that you maybe go to a flying school/Club and with their permission, plan a day there and any PPL guys passing through the school/club, grab them and maybe in return, buy them a cup of tea! Every PPL loves a cuppa at their local flying club
. Im sure you will get loads of guys/girls help you out. Just an idea.
Best of luck with your research
Kev