Promo, that was exactly what I was thinking about in my point 1.b.2. Still an open question in my mind....
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Roger, very interesting! On reading this, I rushed to have another look at my example under a magnifying lamp, but alas, it is blank, the same as Roger C's. D.
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Yes muffet - a good point. I think there is a lot of new evidence trickling from some excellent collections, and a fair bit of thinking out loud. Once this thread has exhausted, the best points and photos could probably generate a new book....ATB, D.