I thoroughly recommend the Dover books reprint of Henry Mayhew. "London Labour and the London poor" it is absolutely fascinating. People who had a brass farthing to rub together could enjoy eating 2 day old leftovers from the posh banquets, sold on the streets. (2 days because much of it was premade and so a day or so old by the time it hit the banquet table) Trifle and Lobster for anyone. Clothes rental was a thing. Dirt collecting had specialities with "pure" dog dung fetching extra prices for leather tanning.

I think Mayhew may have fed into Sydney and Beatrice Webb which in turn much later leads to Labour party policy, and ultimately the Beveridge report and birth of the welfare state.

Also, if you enjoyed Doctor Doolittle by Hugh Lofting you will be familiar with Matthew the cats meat man.