On the subject of training, I was listening to the Nicky Campbell phone-in this morning to a woman who said she'd been a safety trainer working for the Home Office.
I can't remember her exact wording, but it was something along the lines that she was shocked that Henry Nowak had been handcuffed behind his back when he was on the ground, saying he had been stabbed, and was obviously not a danger to the arresting officer - who should have been checking his condition, not handcuffing him. I think she said that in situations where an officer is not in danger the protocol is to handcuff in front in order to control a situation.
Whatever, I'm sure all this will be explained in the upcoming investigations.