Interesting, I was always under the impression they were more favored in the UK? ? ?
I've not come across any UK adverts for Busch Pressman Camera's and even Graflex's weren't that common pre-WWII although Kodak did advertise & sell them with British lenses in the 20's, later at some point in the 30's Folmer themselves began to advertise them but with their US address. Kodak still sold them through their professional outlets but didn't distribute them.
After WWII under the UK Government's austerity measures it was almost impossible to import foreign made cameras. Graflex got around this with some kind of deal with MPP, and the MPP MicroPress is a collaborative camera with the shutter, focus-rail, front standard & bellows made by Graflex and the case made by Celestion, a loudspeaker manufacturer (same owners as MPP) then assembled by MPP.
Pre-WWII British press cameras often had better features than the Graflex's with rotating backs, more movements, and there were many Germna cameras available as well.
Graflex later couldn't compete with the MPP Technical camera's which were based on the 1939 Linhof's and vastly superior, that eventually led Graflex to design the Super Graphics but they were 20 years too late.
Ian