If you have visited the UK in the past decades and enjoyed having a drink or two or ten, then you probably heard the above quoted phrase many a night. As a younger man, I spent a fair amount of time traveling around the UK and spent part of that time in pubs getting drunk, or pissed, as our British cousins say. Because of a law passed during World War One, British pubs closed at 10:00 pm. No exceptions. When I was young, and did a lot of drinking, I was just getting warmed up by 10:00 pm so being forced to stop drinking at that early hour was annoying.
Just to show the power of inertia, this temporary measure passed during World War One was not repealed until 2005.