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have a look at humanitariantimber.org - the booklet for download there has a summary of key points re: termites and timber(section 9.4)..
the best document on this is building out termites - have a copy at home - best sourced through Amazon or similar second hand bookseller as it is out of print. happy to chat if better support is needed - or call Dave Hodgkin - he is great on this kind of thing..
Joseph Ashmore