Rick brings up mudlarking the Thames' banks in both his TV show and his radio podcast ( he can't get enough of single-use clay pipes ) and he had a guest on in 2021 named Lara Maiklem who has a popular history book about it:
Well, now the subject is getting academic treatment from Princeton Univ. Press with a new book by Malcolm Russell that uses the mudlarking finds to talk about the everyday folks of London's past:
In typical Ivy League style, they call it a demotic history.
An example: taverns had their own tokens that people would buy and then use for goods and services in those establishments (kind of like poker chips), but people would take a token and bend it and then give it to a sweetheart or buddy as a token of a promise or pledge -- plenty of bent coins are in the mudlarkers' collections. Were they promises fulfilled, or forfeited?