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Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
@Gordon
Hi - that's great - thanks for posting up!
As you say 6uA is not such a big deal, but if you did want to reduce it further, as far as I can tell the ADC pin on the Espruino Pico is 5v tolerant (even if it won't measure above 3.3v), so you could attach the GND part of the potential divider to a GPIO, and then let that GPIO float normally and pull it to GND when measuring.
Also putting a small capacitor between A5 and GND can help with ADC measurement accuracy if you need it (they get less accurate when they're measuring a high resistance).