the beau mk I works and the other has the same problem? I'm using maybe more than a hudred mod, mainly aircrafts with some effect mod, and some mapmod. They use their own cockpit the beaus cockpit quite similar to the Blenheim's cockpit and the wellington hes it's own too.
You still haven't got so much mod try to deactivate all of them, then activate them one by one but start with the Beaus and with the wellington ( and of course with the weapons pack for these two birds), test them, try to load a mission chechk the weapon loadouts, and do the same every time you activate an other mod.
This have to show your which mod has a conflict with the Beaus, and wellington. IF you still have the problem when just the beaus and the wellington active, well I don't know then they should work, then please post your log file, if you don't know how to do that send me a pm and then I 'll help.