Been there, done the factory tour
Went round some 20 years ago on a factory tour. I was amazed how the entire place was just like a home loading set up, up scaled. Metal detectors on the doorways, of course.
The only bit of BAE that makes stuff from the raw materials right the way through to the end product. Bet they'll not be smelting the steel on site though now, which they used to do with the brass.