[CMOTD]

That is brilliant Keith, thanks very much.   It seems the first part of the story needs to be rewritten as the March track is not the original.

Couple of points if you could clarify:
1) One of your photos would indicate it was run clockwise. At Mussel Bay it was run anti clockwise.

2) The only discrepancy I could see between the two tracks is the absence of the 'S' bends which were a prominent feature of the Mussel Bay track. The March track did have these so is it possible that this section was grafted on from there? Also the original banked dogleg looks similar to the March track as well.