Dear Danny
It's a long time ago now but luckily my purloined PNs tell me that the EMERG. BOMBS JETTISON (proper name) did open the doors and jettison all the bombs - did anyone ever have cause to use it? 25 pounders were on their own carrier though, and couldn't be jettisoned. They were armed on the ground and could, and did from time to time, hang up because they had frozen on to the crutches (is that the right term?), and then drop on to the doors when the ice melted.
And a general enquiry: does 9 still have the bogseat from the Prussian Queen? (At the time there was also a completed wartime Authorisation Book in the B Flight Office. Is it still there?)