Well, some tailors DO imitate. E.g,, Richard Anderson himself says that his cut is purist Huntsman. There are several A&S "expats" who claim to be more religiously devoted to the "old" A&S cut than the mothership itself is. The late Brian Russell was said to be "more A&S than A&S."
Len has no specific allegiance to a specific SR house. But, as Flusser wrote a long time ago, SR has two poles, Huntsman and A&S, with Poole more or less in the middle. The majority of SR firms are far closer/similar to Huntsman than to A&S. Len was trained in that tradition too, moreover, it's what he prefers. So, I suppose if a customer can tell the nuanced differences between Logsdail and Huntsman (which would be evident only to a conoseiur with an extremely well trained eye) and prefers the latter, then he should only buy from them. However, if he simply prefers that approach to A&S (which is far more obvious to the untrained eye) then he might well be very happy with Len. Especially if he prefers a local option, which has a lot of advantages.