It's not like the world of blend definition is clear cut as it is.Having your own definition of something like a term used when talking about tobacco is like making up your own definition of the period when talking about grammar. It will get confusing as heck.
To some people an "English Blend", is simply a blend made in England. That would lump the Lakeland blends like Ennerdale Flake in along with Lat bombs like Nightcap. To others it's simply a blend where Latakia is the star.