Ah good one, thanks a million Catone.
While I've got your attention 2 more questions:
1. I'm presuming if I had to 'res up" say 110% for the size of print I was after, that doing it with Aperture (as you describe ) is going to give a better quality print than using the original file and leaving it up to the printer to sort out ?
2. The preset gives a choice of color profile and defaults to sRGB IE61966-2.1 . I don't know anything about this. Can you explain, or is the answer "go and read about it !! "