Love dust in the air?

This week the greenspaces around the town have purred with insects feeding on the wildflowers brought out by the recent warm weather. Bumblebees, hoverflies, craneflies, day-flying moths, they all seemed drunk with the perfume that the bluebells, violets, hawthorn and the rest were pumping out to attract them. On one walk recently I saw a single, male, green-veined white butterfly