Bolt Mystery Solved

Yesterday I went to a wedding and found a bolt in my trouser pocket. Very strange. Today I remembered why. The last time I wore my suit was at a Humber Care Tech Challenge communications event near the Humber Bridge. Because it was supposed to be posh the suit came out. Then, on the way back I stopped off to buy some bolts for holding air quality sensors to lamp posts. The one in my pocket was the pattern that I took along to make sure that I get ones that match.