Copy sent to Jon directly. Also available here http://webarchive.nationalarchives.gov.uk/tna/+/http://www.dti.gov.uk/renew= ables/publications/pdfs/SP200349.pdf/ Aluminised Mylar film (or that is allegedly what it is) is available as gift wrapping paper. The above report suggests that it's not in fact Mylar. My very rough tests with it on a 660 mm satellite dish produced impressive results. It tried to burn the house down while I was asleep :-). Needless to say, I had a part in allowing it to try to do this. Lesson learned :-) (probably). Russell --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .