It seems to me from twitter that these two things are both true:
a) The police acted terribly
b) The Clapham protest ended up basically being led by by Sisters Uncut, who are the extremist TRAs who assaulted Maria Machlachlan. They put up some sign about "t*rfs", and made speeches that a journalist on twitter said that in their opinion constituted contempt of court and could endanger the trial. Also, being Sisters Uncut, they had angry lairy blokes with them creating an aggressive atmosphere (which still does not in any way excuse the police reaction)
I saw an interview with Patsy Stevenson, the woman pictured being arrested. Her first words were how this is about "ALL women, transwomen and c*s women..."
So overall I don't feel that either side are covered in glory. I think it is pretty shite that Sisters Uncut tried to hijack this for a TRA agenda.