It happened 100 yards from my friend's house in Streatham. His daughter was unknowingly walking towards the incident when somebody stopped her and told her something was going on and she should go back home.
Militant Islamists have no place in British society. Once they are convicted they should never be released unless they can prove their complete rejection of their former ideology. How that could be done I'm not sure. Perhaps lie detector tests could be part of it. Somebody who is still a potential danger needs to be denied liberty permanently.