Guys just an update to this project.
Version 1.2 firmware is now available for download
Bugfix: Shutter did not release unless camera type was specifically set.
Feature: Pressing Button 5 for at least 1 second now cancels the entire exposure setting (Saves having to reset the unit)
After managing to tread on my existing PIC programmer and then getting another which didn't work . I finally got hold of a decent USB programmer which does 'what it says on the tin'.
I can now work on my other two projects which are a temperature controlled PC interface focus unit which can also function (with revised firmware) as a temperature controlled dew buster (similar to commercial units available for crazy money and compatible with heater tapes commercially available).