Thanks for that informative reply DJ, and all good points.
I'd like to pose a hypothetical if I may, to stimulate some thinking on the pro/amateur divide. What would happen if each person on IIS was granted, say, an hour's time on the Hubble Space Telescope, with the following provisos:
1. That their use of Hubble would be aimed at improving our understanding of the Universe;
2. That this aim could be clearly elucidated.
I realise that Hubble does not necessarily suit all pros in their endeavours, but it's just an example for the sake of argument. Now I know what your answer would be DJ

but I know that I would be utterly lost

. How many of us could comply (without lying of course, just to get a shot at it!!!

)?
Cheers -