Having had time to really look at the video, which has obviously been edited as bits don't follow on, I don't see beyond not telling them their numbers (which may have been their instructions) what the police have done wrong there. As I explained on another thread wherever possibly police are required to use specific methods of moving demonstrators/suspects/prisoners etc, this is why so many officers are used, that's Home Office guidelines in place.
The women claimed she was choked, she wasn't, as myusername said, it was a mastoid hold, it's been changed recently, it used to be first finger under the nose pushing up and the thumb on the mastoid bone, painful but harmless. Now it's just the hold against the mastoid to save the officers being bitten.
Taking photographs of police officers isn't illegal but I think many officers as perhaps many of you will, might prefer not to be photographed. The bobbies who patrol around London tourist spots will always oblige but understandably perhaps the Special Branch wouldn't want to have their photos taken!
Taking photos of government buildings and MOD sites has always come under the Official Secrets Act dating probably from when photography was invented! MOD sites have notices stating this fact all along their fencelines so it shouldn't be a surprise and they aren't secret.
If you go on FIT Watch's website you will see they have the numbers of the police officers so they must have been displaying them somewhere which gives a lie to the fact they weren't displaying them. They also post up
" FIT Watch can be done by anyone and can be as passive or
as confrontational as you wish. "
http://fitwatch.blogspot.com/
I should point out that police surveillance including CCTV, cameras and filming has gone a long way to stop the appalling football violence we suffered here. We have also recently been suffered from violance at big conferences, not by genuine protestors but by people who come specifically to commit acts of violence.
http://www.youtube.com/watch?v=6p-yiJaiHNg&feature=related
In London where the police aren't wearing riot gear and aren't protected.
Anti Nato riots in France.
http://www.youtube.com/watch?v=h_dRTcSLjQk&feature=related
One thing you may or may not be surprised about is how many photographs of the same people pop up across Europe in these situations.