The London Metropolitan Police's website, which formerly had a rather detailed series of history pages in timeline format, now has a chronology of "important dates" marking only two things: technological advances and the inclusion of women and black people on the police force. #resipsaloquitur

https://www.met.police.uk/police-forces/metropolitan-police/areas/about-us/about-the-met/met-museums-archives/important-dates/

(no, YOU have to use wikipedia to look up basic UK policing facts when you teach British detective fiction)