Many thanks, that is very useful information.

Yes - thanks for those comments.

Regarding potatos, I vaguely remember some spud advocates claiming man can live on potatos alone.

Random links - its the year of the potato
http://www.potato2008.org/en/index.html
http://www.csmonitor.com/2008/0507/p17s02-hfes.html
http://www.treehugger.com/files/2008/04/can-the-potato-save-the-world.ph...