As a potter one of the things I learned early on was it all depends on the clay used in the teacup.
Traditional low fired red earthenware pots will crack if boiling liquid is poured in. Milk first to cool it
Porcelain, on the other hand, is stronger and won't crack so tea first and probably no milk. Porcelain in the 18th century was expensive so the preserve of the rich who liked to drink out of dainty translucent white cups Milk wasn't usual. Lemon was preferred.
I like milk in mine , add it after and even have milk in herb tea.
Burnhams Tax on Cash ISAS and Death tax
Embarrassing problem following surgery
What has survived in your garden with minimal or no watering?

