[Zanaspus]

All non-aromatics benefit from aging. Your Butternut Burley is best smoked fresh as if you put it away for a long period of time, the "Butternut" would fade.

Squadron Leader should age fine as should any other English. The tobacco that gains the most from a rest is any Virginia/Virginia and Perique. A few classic and easy to find Virginias off the top of my head: Escudo, Hal O' the Wynd, Blackwoods Flake, Opening Night, Christmas Cheer and oh so many more.

A bit of warning if you haven't smoke straight Virginias before. SMOKE SLOWLY! If you think you're going slow, cut that by half. You get the best flavors from these tobaccos when they are literally on the verge of going out.

It sounds as though you may be early in your pipe adventures. Don't worry, in time you'll have a cellar and wonder how you got it. One method folks use is to buy two tins of what they plan to smoke each purchase. They smoke one and cellar the other.