I think that I remember reading that Lawrence of Arabia rode a Vincent. Not a real person, but a comic strip back in the 60's, Steve Roper/Mike Nomad, had Nomad on a Vincent in a couple strips. I believe Jay Leno has a Vincent or 2 in his collection. gypsyman
Lawrence of Arabia rode a Brough-Superior,British made with a 1000cc J.A.p motor. JAP stood for James A Prestwick.