On this Github page where I got the npm from it doesn't actually say where it just says "If you installed Node Red globally use this command to install npm install --global node-red-contrib-blynk-iot"
And as I'm running a RPi with DietPi I followed the advice from a post here on the discourse, which states as above to install in /mnt/dietpi_userdata/node-red. which I did and there is no trace of anything having been installed.
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