The Small Blues are just out. Mark spotted this one at Compton Down (North Dorset) on 07/05/2019. They have also been seen at Fontmell Down, not far from Compton Down, and 16 were counted on the Weymouth Relief Road cutting.
They are tiny butterflies, appearing a silver-grey colour in flight. They are quite rare, but became more widespread in Dorset between 2010 and 2014. Nationally, they have reduced in abundance.