Much appreciated Henrik that seems to work very well.

I will post my pbpro OBDII code for ISO9141 vehicles when finished for those who may want to make their own reader?
All been done before probably and much better than i have done it i'm sure, a good learning experience for me though.
My gizmo now reads DTC codes, send/receives PID's and can clear codes etc. All using the trusty 12F683