Ere Nigel, there are more buzzards in the Avebury region than any other bird of prey, larks appear to be going missing big time on the downs, and Old Speckled Hen is 4 bottles for £5 in Morrisons !
but as you mention wind....
when the wind is blowing from the direction of Silbury there is added lift over Avebury and kites go much much higher, what that has to do with the price of Old Speckled Hen I don't know ?
VBB