"............ Is it better to erect the tunnel with its sides or ends
facing the prevailing wind, or does one site the tunnel according to compass
points? ................"

Well this depends on what you want to do with the tunnel.
If you want to use it for winter growing then East -West gives you maximum
winter sunlight and so more heat.
If you want it for Summer use then North-South will give you the best of
Morning and Evening sun..
If you can angle the ends a little..I move the door posts out from the end
line by about 6 to 9 inches, this cuts down the resistance to the wind a
little.




--
David Hill
Abacus nurseries
www.abacus-nurseries.co.uk