Richard Coulton & Ben Dew 
Tea and the Tea-Table in Eighteenth-Century England Vol 4 [PDF ebook] 

This four-volume, reset collection takes as its starting point the earliest substantial descriptions of tea as a commodity in the mid-seventeenth century, and ends in the early nineteenth century with two key events: the discovery of tea plants in Assam in 1823, and the dissolution of the East India Company’s monopoly on the tea trade in 1833.