Used to be that latakia blends were latakia, VA and Oriental, and if the per cent of latakia was a theoretical constant, those blends with more VA would be called English, while those with more Oriental were Balkan. But that was confusing as due to the English purity laws, British tobaccos had to be this and that and whatever, and these tobaccos were also called English. The definition above held for a few years on the forum in which I then participated, but then exceptions broke the rule, and because I wasn't interested in knowing a new rule about blends that I so little smoked, I lost interest.
Hope this helps-).