Deputy commissioner Sir Stephen House acknowledged a warrant card may not be enough to convince members of the public that the holder is a legitimate police officer and said members of the public would be able to phone the police control room to check the officer is legitimate.
How the hell is that gonna help?
It's not like any attacker pretending to be police officer or any other, is going to give the opportunity for a check!
I wonder sometimes if some people actually live in the real world ?