It was stated by the engineers while I was there that they mostly recorded film scores and the manager of the composer noted that, to get time in Abbey Road Studio 1 specifically, you generally had to "challenge" a bunch of dates 18 months in advance and pre-pay for the time then, because the vast majority of the dates were blocked off for major film studios. So then they would give you the date(s) if the owner of the larger block didn't object(and I assume also pre-pay and specify the project needing that date block, wasn't too clear on what happened if they rejected all of your challenges).
We're getting pretty far afield though. My point was mainly it's a wrong assumption that the use of these B&Ws in recording studios imply that they have a substantial effect on the final sound. IF they're used for mixing/mastering, then they obviously would, but that is by no means the rule even at studios that heavily advertise B&W use. They still have other stuff available and use it, as I would expect from any competent professionals.
Mixing/Mastering on one brand or even worse one model of speaker doesn't really make any sense.