Known a few radio techs in the 60's who came close - me included. The STR18 aerial coupler, with a reputation for sticking gears, was embedded in the roof at the rear of the bomb bay. As HF comms was fairly critical for any Vulcan mission, it wasn't unusual for a tech to climb up unscrew the fasterners on the coupler cover panel and give the unit a belt with a calibrated hammer.
If the aircrew were convinced that Ivan was on his way, then with the engines straining at the leash, they weren't keen on hanging about for the tech to exit the bomb bay. I've seen one Crew Chief flatly refuse to remove the chocks until the guy was out. Thankfully.