The website has changed slightly this year and it is hosted by Butterfly Conservation at: https://bigbutterflycount.butterfly-conservation.org/about
It’s an important survey for us to carry out because it demonstrates changes in numbers within butterfly species from year to year. Weather data is collected later to see if there is any correlation with ‘good’ years and ‘bad’ years. And important to use the same locations to compare over the years.
You can do as many surveys as you like. There is an app or you can use a notebook and upload the most representative counts at the end of the survey period which is August 9th.