In message , Jeremy Pinwhistle
writes
Yes thank you Tim, I have already looked there, which gave me a 'ball-park'
figure. However due to the unique topography of the site, I would like to
get specific data before investing the best part of £20K in a turbine setup.

Fair point. You don't want to blow £20K on a fan in the wrong location.
Hope it works when you get it all installed.

--
Tim
http://www.pitfieldbeershop.co.uk/