At last my new railway room is complete and in use, the existing St Enodoc layout has been set up and I am ready to start building the new Mid-Cornwall Lines, but before doing so I thought I would tell you a little bit of history to put the project in context and, I hope, explain why a little slice of Cornwall is taking shape in suburban Sydney, Australia.   Are you sitting comfortably? Then I’ll begin.   My life with model railways goes back to when I was about three or four. Not, as was of