is wealth sufficient to be classed as posh? I've seen some rich people with boats who are definately not posh, ie no education, no manners and no class but plenty dosh.
Wealthy yes, posh, no. there's more to it than that. I also have some posh rich clients, some I like and some I don't. None of them ride though.
I don't expect any "posh" people would consider themselves a "biker". A "motorcyclist" maybe...