It's the classic CC/BCC error. The Met Police wanted to send out an innocent survey to recent victims of crime, only the big list of email addresses was pasted into the wrong box so everyone saw everyone else's email address. Outrage naturally followed.
London's Met Police has bought a high-grade mobile surveillance system, which can create a fake mobile network, fool your phone into connecting to it, then intercept your communications and track you via IMEI code. It is not messing about.