After lots of searching and PRAM/cache rebuilds discovered it is a hardware problem. The ribbon cable for the keyboard bends as it enters the motherboard connector and stops keys or trackpad working.
To test, power on the MBP by mains, lay it open on the back of it's screen, take out the battery and press your finger on the location shown in red on this photo:
Whilst pressing here, try the keyboard, it should work again!
Not sure of a permanent fix, but a temporary solution is to take a small piece of card or folded sellotape and stick it to this location, put the battery back in and you are good to go!
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