Britain

1829: England, Select Committee of House of Commons re opium sale in China, hears John Francis Davis, who had been a President of the Select merchants of Canton during his 17 years in Canton, say, "I never saw a chest of opium in my life; and therefore I cannot speak to it." A bookkeeper, Mr Henry, employed the large opium dealers, Dents (Thomas Dent), said much the same.

1830: Hong Kong: An English supercargo later to be a governor of Hong Kong is John Davis. A firm engaging in trade and also interpreting are the father-and-son, the Morrisons, John and son Robert.

1830s: Bengal and India, Crash of many early "agency houses". Coal mining and paper milling begin in Bengal.

1830: About 64 "private" British ships are delivering their cargoes (including opium) to depot ships for the Chinese markets. Soon will arise debate on whether the English East India Company is even necessary for the present conduct of trade. An interested observer here is Joshua Bates, US partner of Baring Bros. President of the British Canton Factory is Sir J. B. Urmston.
(Bulley, Bombay Ships, p. 170.)

1830: First steamship appears in Chinese waters. One such steamship in 1830 tows an opium carrier for William Jardine.
Bulley, Bombay Ships, p. 245.

1830-1831: Restive country traders (including 44 Bombay Parsis and Canton agents), impatient with restrictions imposed on them by the EICo (as they had felt in 1815 also), petition government/Parliament for relief. The EICo official wings are furious at the "impudence".
Bulley, Bombay Ships, p. 171.

1831: Missionary Rev. Carl Guetzlaff is astounded while on a Chinese junk from Siam to "Shanghae" to see the volume of traffic in silver and opium. Bulley, Bombay Ships, p. 167.

1831: William Jardine reports that in the previous year he has turned over $4.5 million worth of opium.
Bulley, Bombay Ships, p. 170.

1832: On 30 June, Magniac and Co is wound up, on 1 July begins firm Jardine, Matheson and Co. (Keswick, appendices.)

1833: First ship Fairy built for Jardine-Matheson at Liverpool. J&M send first ship Lady Hayesto Sydney, with tea cargo. (Keswick, appendices.)

1827: Opium trader Alexander Matheson of Magniac and Co. Active by 1827 at Canton. For origins of his trade, see Bulley, Bombay Ships, pp. 108.
See Burke's Landed Gentry for Matheson. He is active in Canton by 1827 when he loans a hand press for printing of The Canton Register. (Keswick, Thistle and the Jade, Jardine, appendices.; material by Cheong.)