Having a Flutter?

There is sometimes no pleasure in being proved right. For some time, my local casual observations have been totally at variance with predictions in the media that the UK's hot and sunny summer of 2020 would lead to a 'bumper' butterfly count. I have seen only small numbers of many what were formerly common species. Nettles, in many places, have largely gone uneaten by larvae of Red admiral, Peacock and Small tortoiseshell. Butterfly bush flowers, largely went unvisited by adult butterflies. The largest ever, Big Butterfly Count conducted in July and August, this year has largely confirmed my impression (https://www.theguardian.com/environment/2020/sep/28/record-low-number-british-butterflies-baffles-scientists-annua-big-butterfly-count). Seventy-five percent of the almost 60 species of UK butterflies are in apparent decline, when conditions should have been favourable to them. The 3 species with nettle-eating caterpillars listed above are down 33,42 and 41%, respectively. The only species that seem to have done well, are the Large and Small whites as well as the Common blue. It's difficult to work out reasons for some of the many declines but I don't think it can simply be due to 'global warming'. The count was UK wide so, if temperature was a factor, they would just be seen in another area of their range.