This is such an important survey and is now the world’s biggest survey of butterflies. It might seem repetitive but this is the only way to compare year on year so if you have done this survey before, please go back to the old locations and repeat! If you are new to this then please look up all the details on their website where you will find all the information you need including an identification sheet to download; each survey lasts just 15 minutes and you can do as many as you want. Tip: sunny days are usually best!
Here is a link to the website: https://bigbutterflycount.butterfly-conservation.org/about