Thanks for the information Jobrot. However I think in light of your strange behaviour in protecting this page in its current form we need to look at these issues again. From recent posting I can see there is a consensus for this. Maybe we need to declare you 'too interested' in this page. Quoting wikipedia and then making weak points unrelated to what you have quoted is NOT the Wikipedia way. I'm sure you'd have no objection to this if you weren't overly 'interested'...