where does the name old bill come from
The Bill In its final year on air, The Bill was broadcast once a week, usually on Tuesdays or Thursdays, in a one-hour format. The programme focused on the lives and work of one shift of police officers, rather than on any particular aspect of police work. The Bill was the second longest-running police procedural television series in the United Kingdom, and among the longest running of any British television series. The title originates from "Old Bill", a slang term for the police.
Bill (law) A bill is proposed legislation under consideration by a legislature.[1] A bill does not become law until it is passed by the legislature and, in most cases, approved by the executive. Once a bill has been enacted into law, it is called an act of the legislature, or a statute.