I had a tin of GLP Westminster that lost its Lat flavor completely, and the Virginia aging did not improve it enough to bring up the taste. So I would plan to smoke English blends with Lat within a few years of new purchase. You can get lucky, but also remember, once the tin is open, the Lat will fade even faster. Or this has been my experience. English blends without Lat seem to hold their own, as Virginias, Orientals, Turkish, dark fired, burley, and Cavendish seem to hold for quite a while. Remember, not all English blends have Latakia. Incidentally, I smoked up the Westminster by adding a little Turkish and/or cigar leaf, and it was pleasant, not euphoric but pleasant.