Clubmans of old wouldn't have had coaster-brake hubs (well, they wouldn't have had CF or Ti frames for that matter). A nice narrow range hub like a Sturmey AM is the ticket (that's what my 1951 Raleigh Clubman has). Then again, my 1948 Claud Butler has a fillet-brazed (i.e., non-lugged) steel frame and a flip-flop rear hub, and that was enough for the English clubman of the time.

Neal