"Anyway, the Android app, I did just try install and fire it up on a tablet and it worked - the version that says '(Kano)' on the end.

So my only guess would be that whatever is causing the Discord problem may be causing the App problem?"

Tried an old Phone (Huawei P20 Pro) and the app still works fine, new one I have had for about 3 months (One Plus did work fine but now app crashes (in last 2 weeks) as soon as trying to open it so guess the app does not like something in the Oxygen OS.
Will use an old Android phone for now to run app :-)
Will try and join you on Discord some other time (not that I have ever needed help in the past as the KanoPool just works :-)
All the best