OK concrete floor done...pretty hard work but very satisfying to see the completed floor.  I had a bit of help from my Dad and my Father-in-law, although I did all of the barrowing it was good to have some support around.  In terms of number of barrows - I have no idea as counting was the last thing on my mind but we did get the entire load out in just over 20 minutes.  My tamping method worked out really well and achieved  a good level floor.  I didn't go for a smooth finish as this is going to be well covered at the end.

>>photos<<