The crew door on the Vulcan was just ahead of the nose gear and after a belly landing, if the rear crew had not bailed out, they would have to scramble up into the cockpit and out through the jettisoned canopy aperture. The pilots would have already got out of the way and made the seats safe for the rest of the crew to step over. Bailing out with the nose gear down was tricky as the leg was in the way and you would have to push yourself round it after using the crew door as a chute. That's the way I remember it anyway, 39 years down the road.
