I have potentially just discovered the Most Rural Thing.
Friend mentioned buying a second hand window. I asked where. She said a name. I didn't know they had a shop or a junkyard...?
She explained that he owns one of the old train station sheds, it's full of reclaimed building materials. There are no opening hours or appointments. It's always unlocked. You can go in, look around, give them a call if you want anything. But be careful, both the roof and floor are falling away.