Took a ride out to Flamborough Head the other day beautiful day but not a lot of butterflies about, did get this one though a Wall Brown and a first for me. Lot of birds though and lots of predated eggs I'll post a picture in the bird section later when I've processed them. ''the pictures not the eggs'' ian.
They use to be quite common on farmland habitats too when I was a boy, but since farmland practices has become much more intensive not so any more. But then again lots of other insects have disappeared too not to mention farmland birds; I have a suspicion global warming is now lending a hand as well in which air pollution is not helping either and being largely ignored for financial reasons. But no doubt someone will sit up and take notice when most of the earth disappears under a sea of water along with clouds of methane gas, echoed by Green peace, not to mention asthma, and cancer in which one of the causes is diesel fumes.
I think that they took a dive sometime in the 60s but can`t be more definite than that. I have had good literature search sinch answering and find that they are only really thriving in certain coastal habitats these days.
I have read that one of the reasons for their decline is due to the fact there were attempting a third generation in a year but this usually unsuccessfully. The only place around the London area where I'm aware they still are is by Swanscombe Marshes to the east. Generally in the south-east + East Anglia it now seems to be largely coastal.