After reading about it on here, i filmed stbExH whilst I was asking him something perfectly politely. When he was completely unreasonable I had to show that i was filming, at which point he assaulted me on camera.
This is the first assault that I can actually report, and it never would have occurred to me to film without reading it on here. I actually told the policeman that I read it on here. I don't think he'd heard of mumsnet though.