It won't be confused with the original. They measured that suit within an inch of its life (they've obviously taken on this kind of project before), but made a few aesthetic changes. The notches, as I said, and the contour of the lapel. (That's their call-- I didn't meet them at the Armoury.)
At the first fitting, they tried to put in a lot of shoulder padding. I persuaded them to take out half of it and it still looks noticeably crisper than elderly A&S. Also, they were reluctant to move the armholes too tight. They did make the jacket a bit longer as well, and trimmed up the trouser legs (which might have needed it anyway).
The result doesn't look especially A&S-like, and unlike the drape suit doesn't grab me under the arms. Rather, it floats on my shoulders. While I suspect they don't do the A&S Secret Sauce on the canvas, their preference for much lighter construction makes it very comfortable on the chest. Oddly enough, it actually fits me better than their first SB jacket. The armscyes aren't nearly as tight as I like them but the structure of the jacket holds them right where they should be in relation to my shoulders, so there's plenty of freedom to move. (Normally, I have found that tailors are more apt to screw up a DB than a SB early on, as there is less flexibility to adapt to a bad cut.)
So-- all in all, a good suit, with prospects of even better ones to follow. But if I want A&S, I'll have to call London.