Was hit by a BE cancellation last Thursday when the morning BHX-DUS-BHX flight on a Q400 got cancelled. To my surprise, BE let the MAN-based Embraer 175 operate MAN-BHX-DUS, which resulted in a 90 minute or so delay at DUS. The return flight operated inly DUS-MAN and the BHX-bound pax were bussed from there. Is it a SOP to combine MAN/BHX flights if necessary or was that just a one-off (interestingly, BE had no problem accommodating all BHX pax on the MAN flight...)