Thank you mate, all working now - some weirdness going on with my weather station sending data out over a different port each time, so my NAT rule wasn’t catching it. I created one based on the destination instead of the source and that seems to have done the trick.
With a bit of poking around I’ve made some improvements to pws_server.py to include MQTT auto discovery, and handle missing sensors more gracefully without having to delete that part of the code from the file; I’ll put up a PR shortly.
Thanks again, this is a fantastic tool and much nicer than relying on WU to get my own data!