Every five years Butterfly Conservation produces a national butterfly atlas. In order to achieve coverage across the whole UTB region, the aim is to visit each tetrad (2x2km) of each 10x10km square at least once in each season over the 5-year atlas period. The champion of each square is responsible for carrying out this surveying activity.

The map below shows the 10km squares in the UTB region. Click on a square for more information. If you are interested in becoming a champion, please contact the 10km Square co-ordinator (Andy Spragg) at 10k-coordinator@upperthames-butterflies.upperthames-butterflies.org.uk.