Hi Tumbleweed,

You are a star, thank you.

I don't know how I missed that bit, correcting it saw the Opamp spring to life... in fact I tried a bunch of combinations with TRIS and ANSEL and it was difficult to make the Opamp fail to do its job!

It sounds obvious but to use the Opamp as a buffer one needs to remove any feedback resistors (of course).

Thanks again, I hope this is of use to others.

Kind regards,
Bill