Danny,
I'd be interested to see what your Sexton / Priest actually is. Post a piccie here, so the collective wisdom on HMVF can help you identify her.
As for parts, try contacting Ivo Rigter here in Holland via his site www.priestm7b1.nl, he has restored a Priest and is/was involved in other restorations. He should be able to help or point you in the right direction.
Sure, I'm open to receive PM's. Not sure if I can help, but always willing to try.
Regards,
Hanno