I've seen posts by MNHQ before about temporary bans for longstanding members (such as this one: www.mumsnet.com/Talk/site_stuff/1891620-Why-we-temporarily-banned-Anyfucker-and-what-next) but it seems if you're not mumsnet famous, you can get IP banned for ones single [satirical] post, with no warnings, no chance to come back, nothing.
Is there any way of talking to MNHQ about it? Or is that just it?