Well I got there!

installed XP on a spare disk. (note did not work with WinXP SP1 or WinXP SP3)

connected via usb no problem.

ran dfu-programmer

all worked fine

I’ll keep that disk handy for any future updates etc.
shall get one of these

then dead easy to switch in / out

thanks for your help - any ideas on Win 7 / 10 might be worth checking? But it worked so well under XP I’m happy to stay with that

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