Fire-fighting
As I say I'm no Nimrod expert - though I used to sail with someone who is ( but he will have his hands tied ) as far as I know the days of dropping flares etc from the bomb bay are gone, I would think fire fighting in the bomb bay pretty unnecessary & bolting the door after the nag has gone, but attention to the AAR from what little I've read seems a good idea - more static discharge prevention, double skinning, for a start ?
Even double skinning has it's own risks, this is not a simple mod' as is proven by the number of posts.