Many thanks guys for your valued responses.My computer died shortly after i posted this thread and only now have become up and running again.I've had a look at the suggested reading sites and am finding it terrific reference and help.Many thanks to you all again.Once the weather clears i'le post the results of my results of my these observations and give you my feedback or better still come to Rons place in the upcoming months and tell me yourself.
Clear Skys,Peter.
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