I asked a similar question on 24th August 2013 and received some very helpful answers with particularly succinct one from Henry Link.
I don't know how to attach that thread to his one, but of you click on my user name and follow the posts to the above date and click on that you can look at the whole thread.
If anyone can attach that thread or tell me how to do it, it would be helpful.
Stan
Many thanks Stan, I will search it out.
Ben
I think this may be it, some helpful responses. http://www.birdforum.net/showthread.php?t=264975
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