Re: DECU
Um, no. The Concorde had, like all commercial jets at the time, that strange invention called a Flight Engineer who did all the hard work at his panel at the back of the cockpit while Captain Speaking and First Officer Here flew the jet (or at least backed up the analogue - not digital! - autopilot)...
They might have fitted DECU later but the Olympus originally flew without...
Mine's the one with "Coneheads forever" patches...