Thanks Sonic.
Sorry for hijacking your build thread. I was surprised at the mix of pot values and wondered what you might have come across on your build.
A big thanks to Simon for all the detail.
And thanks also McCreed.
I will take all this info away and sort out the best approach.
When I have a clear picture of what I want to do I will post it up on my build diary for some more help/feedback.
Thanks once again to everyone.