As if I needed any additional reminders of what a dunce I am, my German contact's just reminded me that "things aren't what they used to be..", and the Politz where the refineries were, is now in Poland, hence has a different name, and the Politz I've been looking at, while close to where the Mossie came down, is nowhere near the former oil facility.
Live and learn....
Thanks again Guppy.