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Ross73, was there a size discrepancy between tube and tire? What you describe can sometimes happen when you use a very thin tube in a fatter tire.
I got my first flat on my new bike yesterday. I've had this bike about a month now, commuting about 14 miles every day. Yesterday on leaving my office I saw the rear tire was very low, but not quite flat. I pumped up and rode to the station. It went soft during my train ride, so I pumped it up and rode home. Patched the tube later. There was a tiny scrap of shiny steel wire poked all the way through the tread off the tire.