The Wider Countryside Butterfly Survey is the UK Butterfly Monitoring Scheme‘s large-scale nationwide study, similar to the BTO’s Breeding Bird Survey. So similar, in fact, that you can walk your own BBS 1-km square looking for butterflies and submit that.
There are a couple of differences between the survey methods – here you also record the percentage of sunshine per section and take an average temperature reading as well.
You will already have mapped the habitat for the BBS, and this plus the birds found in previous visits may throw up some interesting correlations for the scientists at the two organisations. Each year’s findings get published in a Newsletter.