Thanks Steve.
I'm afraid I had what I thought was a nearly working program and in trying to fix some issues, I kept adding mods,which is where a lot of the strange spaghetti code came from.
I followed your advice - basically starting from scratch and kept a closer eye on what I was trying to achieve. I think this is better code - it certainly works, but I'd appreciate your thoughts on it.
Part of the complexity for me is keeping a global state, where there are two sets of controls for the mode; one on the ESP+Sensor and one on the NodeRed Dashboard. Keeping state with flow variables did the trick and getting and setting them at the start and end of functions was invaluable advice (earlier thread, I think)
Thanks for your patience 
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