Gentlemen (including Sir David)
We are being asked by a sister organisation to spend 15 mins counting butterflies this week, and to submit our results via a website link: see www.bigbutterflycount.org
My count produced 2 male iris, fighting - and nothing else, apart from a hornet that got tangled up in the melee and pulverised. These I determined from Brother Neil's excellent picture (Fermyn Woods, 2009) on the official identification chart, though the insects in question looked nothing like that, being old and faded, though far from knackered.
May I suggest we all do likewise, and skew the science...