I think this is the most appropriate place to put this. There may already be one on here but it's a chart showing the thicknesses of sheet steel in both SWG (standard wire gauge) and mm.
thats good wozz, things like that are always handy. I remeber having an old oxford that was marked out with amperage, and welding rods by guage size. days long gone now
Places to buy on the net would be fantastic. I'm trying to find a stockholder near Dumfries or Carlisle, who won't mind supplying a DIY'er with small orders.