I suspect the Boulogne Bouche is a canard.

I wonder if hanging out the Billet meant you could just get a drink, and a Bush meant they had additional faciities in line with bert's misinhgs?

It occurs to me that the idea of hanging out a bush as a sign has a modern day equivalent in Amsterdam, where a bit of shrubbery in the window of a coffee bar is an indication that it's a joint joint. (And they have some pretty weird and wonderful names as well - very like pub names, when you come down to it. "The Bulldog" could be either...)