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I actually have a longer tube somewhere - it came with a shallower drip tray.
Unfortunately the drip tray itself was 3D printed and didn't survive a trip through the dishwasher.
... turns out that drip tray is still available, now more durable than the one I destroyed, and that you can get the tube on its own from here:
https://www.shadesofcoffee.co.uk/stainless-steel-long-vent-tube-6mm-od-x-5mm-id-x-158mm
Yes longer as it creates a bit of a splash