The P-80 might not have seen any action but the Gloster Meteor was introduced into service in July 1944 and saw a fair bit of combat through to the end of the war in Europe. Not a massive impact and wasn't really that important in the grand scheme of things, but it's still an allied jet powered plane that made some contribution to the war effort.
After the original Rolls-Royce Ltd. went bust the British government bought up all it's assets and set up a new company in 1971. The automobile division was spun off as a separate company and sold off a few years later.
The engine company is Rolls-Royce Holdings Plc and ain't a subsidiary of anyone. It's the second largest manufacturer of aircraft engines after CFM.
BMW owns the modern car company and licenses the name and logo from the engine company.
Victoria didn't decree anything. There was a commission set up by the government a year or two before the Great Exhibition to oversee things and the purchasing of land and funding for construction was subject to parliamentary debate and approval.
Your comment about the Mulberry harbours is quite baffling. Are you seriously suggesting that a modern day military operation on the scale of Overlord would be subject to local consultations?