> PIGPIO and GPIOZERO don't need root anymore, the user just needs to be in the
> gpio group

Yes I did read that (and tried following the instructions to update), 
but either it doesn't work or (more likely) I didn't update properly 
everything that needs updating. If it worked, it would obviously be the 
most trivial solution to implement.

I might just get another SD card and put the latest version of raspbian 
on there, if that works OK then I'll copy over all necessary files from 
the old one.

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