Hi, not sure if this is the right place to ask. Was just thinking about poor Sarah Everard and various other crime cases where people have disappeared and not been found. I wondered if back in the early noughties it was possible to ask a cab driver or policeman to ring base to prove they were who they said they were. I know couzens showed ID but I believe poor Sarah wasn’t aware she could ask him to ring base - or was this a law implemented after she died?