Here's two inert rounds I picked up at the Tatton Park architectural and reclamation show in Cheshire today. The first round is a bog-standard 37mm French round, then my eyes spotted the other. My wife was asking me why I was getting so excited at an old bullet as I asked the vendor how much it was. "£5 for the small one, or £15 for the two," he said. I waited until I had paid him and then asked him if he knew what the smaller round was. he just said: "a big bullet." The 'big bullet' is a German WW1 T Gewehr anti-tank round.