BristleKRS has been doing great work on this (which I only just found), including identifying police witnesses to the assault and battery, and putting together potential evidence of command control of some of the events. Still, as he cautioned when he identified one police officer:
This is, I note again, only speculation. Perhaps there were a number of left-handed baton-wielding riot cops with no epaulettes, high cut hi-vis jackets, balaclavas, trousers tucked into their boots, Nato helmets and no shields running around the Royal Exchange area of London between 7:16 and 7:20pm on the 1st of April. Hopefully they will all be making formal statements to account for their own actions and to bear witness to what they saw.He also credited Colin McQuillen/TwoThumbsFresh (some of whose photographic work is in the link), and FIT Watch, a group monitoring the activities of the Forward Intelligence Team (FIT) Police (one of whose relevant blog posts is in the link).
[This was also posted over on Human Rights Archaeology, but I removed it because it was not related to my research.]