I'm late to the discussion, but. . .
For me, a great "standard" English -- and one that's not talked about much -- is Dan Tobacco's London Blend #1000. It is not a "luxury" tobacco (it's not in the same ballpark as GLPease's Westminster, which is a superb blend) and it doesn't have the popularity of, say, Dunhill's Standard Mixture Medium. But after smoking nearly 150 different blends (a small handful compared to some folks here, I'm sure), it remains, for me, a very well-made example of a medium-strength English blend in which all of the elements are well-balanced and discernible. You'll find many English blends that don't live up to it, as well as a number that will exceed it. But I think it makes an excellent middle-of-the-road standard by which to judge traditional English blends in general.
Bob