Thanks WP.

Graham, the last 4 posts (since yours) are all asking questions along a similar theme (although WP forgot a question mark at the end of his post)
It would be really good if you could take time to answer them individually in turn, as they are all subtly different in thrust. If you were to provide a blanket answer to all 4 I fear it might service none of them adequately, and just add to confusion.

Cheers, Sir.