Tea was known in Britain in small quantities from the mid-seventeenth century, but its transformation into a genuinely national drink consumed across every social class owed a great deal to specific, traceable historical developments rather than any obvious inherent appeal above alternative beverages. Catherine of Braganza, a Portuguese princess who married King Charles II in 1662, brought a personal fondness for tea drinking with her to the English court, helping establish it as a fashionable habit among the aristocracy at a moment when royal fashion carried outsized cultural influence.
The East India Company's growing trade dominance through the seventeenth and eighteenth centuries made tea increasingly available, though it remained a heavily taxed luxury good for much of this period — taxed so heavily, in fact, that smuggling became a massive parallel economy, with historians estimating that smuggled tea may have accounted for as much or more of Britain's actual tea consumption as the legally imported and taxed variety through much of the eighteenth century. William Pitt the Younger's 1784 Commutation Act dramatically cut the tea tax specifically to undercut this smuggling trade, making legal tea suddenly affordable enough for ordinary working households, a shift widely credited by historians as the specific policy moment that cemented tea's transition from an aristocratic luxury to a genuinely mass-market national habit consumed across the full range of British social classes.