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@cdb15
Thanks for that, I'll have another look. I have sent a query to GWC via their on-line query box, but nothing back yet. I was planning to write to Keith Jones who is apparently knowledgeable on these matters, but I can only find a postal address. Do you have a current email address? Their covid web site says they will answer emails as soon as practicable, but they don't give any email address that I've been able to find. Thanks very much for your help, really appreciated.
Chris