For many years, I supported a GP owners forum here at GPMINI.net; but with the small amount of GP activity these days, I’ve simplified my support activities by moving the website to WordPress.com, which means there’s no longer any forum.
Elsewhere, there’s a lot of GP owner support on Facebook (here, for example), but if you prefer a true forum there’s a new UK based GP owners forum, that welcomes GP owners worldwide:
Thanks to Colin, for letting me know.