Many thanks to Aaron and Steve for creating and sharing the code and tutorials. Thanks also to the guys who created the mods for the DX6.
I've now programmed 2 TZ85's using the Pololu AVR 1300 and everything worked as the instructions.
First time (on TZ85#1) I used the original code
Second time (on TZ85#2) the I used the DX6i code

...but something odd happened an instant after i'd programmed the second TZ85... the Pololu appeared to uninstall itself and was no longer recognised by the computer (think its died!?) anyone else had this problem with a Pololu 1300???

Tried re-installing the drivers and using on another computer etc but now the green LED only flashes a couple a times and goes out when previously it stayed solid and the other LEDs operated too.