Phoenix:
Unless the manufacturer tells us -- or someone has an incredibly refined palate (calling Mr. Pease!) -- this is nearly impossible to answer. Very very few manufacturers go into detail about their oriental mixtures. Of course, there's latakia! But that's the only oriental-derived leaf I can identify absolutely in this blend. Everything else is pure guesswork based on my own experience and palate.
It's actually easier for me to tell you what is NOT in the blend, based on my own smoking. I would say there is no Basma in the London Mixture; Basma tends to be lightly rich and quite sweet; I noticed nothing like this in my sample of LM. I would also GUESS that there is little or no Drama in the blend; in my experience this can be a sharp and acrid leaf, and I don't recall a strong presence of that in the blend. But I could be wrong about Drama here; my tin had some age on it. . . plus, I'm basing all of this on my memory and my notes from when I last smoked it. (And it may play a different sort of role in a blend when pared with LM's specific Virginias and latakia, as opposed to the original blend on which I'm basing my perception of Drama. Are we having fun yet?)
But Yenidje, Samsun, Smyrna, Sokhoum, Katerini. . . They may all play a role, or it may be only one or two of them.
Bob