I notice that Adagio's English Breakfast is a blend of Keemun teas. This strikes me as a little odd. Speaking as someone from England, most of the English Breakfast blends that I come across are usually a blend of Ceylon, Indian and East African teas - Ceylon for flavour, Indian for strength and African for colour being the rough rule of thumb. It doesn't usually involve Chinese teas!
Is it common in the States to sell Keemun as English Breakfast?
In the UK, Keemun is never added to English Breakfast... that was the point I was making. An extremely well-known tea retailer describes their English Breakfast thus: "The most popular House blend ‘the Tea of the Nation' ... It contains Ceylon for flavour, Assam for strength, and Kenya for colour." That's extremely typical of the English Breakfast in, er, England.