Great question — answering as the UphillTech team:
There's no standard blend for English Breakfast tea, and different tea companies may have their own flavor profile they want to achieve. Generally, the goal is to create a more robust tea that goes well with milk. Traditionally, teas from Assam, Ceylon and Kenya are used for the blend. However, today, teas from more locations are used. The benefit of blending teas from more regions is that the 'average' flavor will stay more consistent throughout the seasons and years. For the tea taster, it's therefore possible to make just small tweaks to maintain that same flavor and aroma profile. In the tea community, you've people who like consistency and go for tea bags and blends, and you've people...
Full answer by Lisa at Teasenz.com: https://cooking.stackexchange.com/a/102650 (CC BY-SA 4.0).
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