The only ones of note that spring to mind are Hodgson,Sir Bobby and Milne.Thing is, you have to be a good manager in the first place to credit a move to foreign shores and the before mentioned had it.I suppose that foreign clubs look at the power British managers wield and decide that it wouldn`t really fit into their traditional set up of coach,director and president.Felix Magath at German champions elect Wolfsburg had it and now takes it to Schalke 04,but he really is the exception.
Asides which British manager is going to teach johnny foreigner ball control,technique,guile and tactics.......answers directed to the FA please !!