But in doing so, I'm quite aware I'm building a relationship with the shopfront people, not the actual tailors cutting and/or making my suits.f.
That's very true. However, as with many things, sadly, we have to choose the level of cost and service we're happy with - as you mention. Most on these fora are happy to pay more for something beyond OTR, but fewer are able (or willing) to pay for true bespoke.
P. Johnson, like all MTM operations, is...