extraordinary differences between neighbouring woods

On the 10th July, a friend saw 10 in the wood mentioned in my 'testosterone' blog for 11th July. On the same day [10th] I was in a wood just 1km away and saw none, looking hard for 2 hours; this is a wood which normally produces good numbers, but not more than about 3 have been seen on any one day this season. Also on the 11th, a field meeting with 40 present in Bernwood Forest, produced only 6 sightings, when I had 31 sightings in the private wood at the same time.
See photo: on the second day of that field meeting [12th], our UT chairman, Nick Bowles, is using his initiative with  'an instrument' to locate a resting female for the benefit of the uninitiated.