Thou shalt not criticise your masters. Readers will note the illegible signature. The rank, surname, station attached, warrant number, and the contact number are all missing.
However, this blogger has identified the culprit as DI Keith Marshall. There is, incidentally, no such thing as a "Bexleyheath councillor". The local authority is the London Borough of Bexley. I know it well ... it used to have a very interesting slaughterhouse.