Hi
In the British OOB unit 320 and 321 seem to have incorrect weapon configurations.
Ie fairy swordfish was a ship bourne torpedo bomber which as far as I can find carried either a torpedo a mine or rockets.
For the two bombs it is -incorrectly- equipped with one is the same weight as a Mine it could carry and the other is close to the weight of its 18 inch torpedo but in the wrong weight units.
see
http://en.wikipedia.org/wiki/Fairey_Swordfish
Best Regards Chuck