May I ask if you are local to London or traveling there regularly?
As a tourist, I found there was more stuff at NBS, (we found DHs size mens sweater that was sold out at home)
but the friendly relaxed vibe was at CP. During our visit to CP, DH got into an extensive conversation with the SA who complimented his watch (DH is nuts about ALange ). They debated, PP, AP, and ALange for a while, and when they eventually noticed me, I got offered the then new etoupe chèvre geta (declined bc I’m not a geta person). I’m pretty sure they would have been open to wish list, but I never thought to ask as we were tourists. We popped into Harrods and hated the bustle and hustle. And the same etoupe geta was on display but not for sale there. If you are open to trying out a few items, TPFers that I have met in NY, seem to like Royal Exchange’s wish list possibilities. Since it’s small, perhaps there is better luck (I’m sure someone will come along to correct or confirm this)