Old Bill wrote:
I would have thought and have read somewhere that its not a good idea
to tile on wood. Justtiles in Reading, who I have a lot of respect
for, do not reccommend it, but if you insist they say you should use
special adhesive http://www.justtiles.co.uk/tilefixingguide.pdf

Thanks for that - very interesting. Stored away for future reference...
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