Does English Breakfast Tea equal Assam Tea? I read from wiki that:


  Assam (Assamese: অসম, Hindi: आसाम, and also Hindi: असम) is a black tea
  named after the region of its production, Assam, in India. Assam tea
  (Assamese: অসমীয়া চাহ, Hindi: असमिया चाय) is manufactured
  specifically from the plant Camellia sinensis var. assamica
  (Masters).1 This tea, most of which is grown at or near sea
  level, is known for its body, briskness, malty flavor, and strong,
  bright color. Assam teas, or blends containing Assam, are often sold
  as "breakfast" teas. English Breakfast tea, Irish Breakfast tea, and
  Scottish Breakfast Tea are common generic names. [3]


Is it true? I need Assam tea for brewing a good cup of Chai Tea. If they are the same stuff, then I don't need go down to Chungking Mansions' indian store for it. ( I live in Hong Kong ) I can just grap one English Breakfast Tea in supermarket.

However, in this wiki about English Breakfast Tea, the tea leaves could also come from Ceylon and Kenya:


  English Breakfast tea is a traditional blend of teas originating from
  Assam, Ceylon and Kenya. It is one of the most popular blended teas
  and the most common form of British tea culture. It was initially
  known simply as Breakfast Tea, and was popularised by Queen Victoria.
I believe that 'English Breakfast Tea' is a very broad definition and doesn't refer to an exact blend; each manufacturer has their own version of it. I would say that English Breakfast Tea often includes Assam, but as your Wiki source suggests it also contains other teas. Therefore Assam is a separate tea.