I don't know about the bomb racks, though apparently they were ideal for carrying a bicycle in the days when people walked or cycled rather than drove.
The spares pannier carried in a V Bomber bomb bay when one went on detachment generally contained the Crew Chief's bicycle. The ossifers would be whisked away in a crew bus while poor old chiefy was left behind to tidy up the aeroplane and make his own way to the Sergeants' Mess.
