Had a useful tip provided to me by Kelvin Jones for Treecreeper nest box design. Also found this link to boxes used in Finland. I found the link through Google having been tipped off by an old post on the NRS Yahoo Forum that a Finnish design was quite successful. I'm assuming it is this one.
http://epa.oszk.hu/01600/01603/00074/pdf/Aquila_EPA-01603_1985_255-261.pdf
It took me a little while to work it out but I understand it now.....
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