I'm curious about anything you've learned. My 4th great grandfather, Richard Cardin, had a company in 1767 London, "Cardin & Day" and Kent's Directory for that year lists them as "hamburgh merchants".

I did learn the "Right Worshipful Company of Merchant Adventurers of England" were kind of formed to trade cloth to Hamburg and Wikipedia says:

"When the Company of London lost its exclusive privileges following the Glorious Revolution of 1689, the admission fees were reduced to £2. After Parliament threw the trade open, the company continued to exist as a fellowship of merchants trading to Hamburg. Because they drove a considerable trade there, members were sometimes called the Hamburg Company. The Merchant Adventurers of London still existed at the beginning of the 19th century."