Rolls-Royce is a big company who make jet engines. See, you don't get that kind of in-depth research from anyone else

The factory is made up of four long main buildings - two appear to be being remodelled or decommissioned, so I started in one of them:
Some jet engines were being stored in this building:
Next over into one of the live buildings:
A heat treating cell:
And this is where I bumped into a worker (at 2am on a Monday morning, he was keen!) - and after that it was running and hiding from security with vans and torches for a bit, which was fun

I reckon I've covered about 1/4 of the factory, and only 1/8 of the live bit, so there's loads more to see - might leave it a bit, though...