Moeee, Bhagwan & Thorns, Thanks for your input it is really appreciated.

I will follow up and post the results. I do like the idea of 4-5 smaller groups and also the calculator should prove invaluable. Once again, Thanks for your input, and from what I have seen, it is these contributions that makes this forum such a success.

Hopefully at some stage I will be able to feed something of value back into the forum as well.

Fred