British Wildlife Wiki
Zygaena trifolii

Courtesy of Wikipedia

The Five-spot Burnet (Zygaena trifolii) is a distinctive, day-flying moth with red hindwings and five red spots on otherwise metallic greenish-blue forewings. This moth favours damp meadows. It is common and widespread in Britain and Ireland. Flies July - August. Larva feeds on greater bird's-foot trefoil. Similar to the Six-spot Burnet which has six spots on it's forewings and favours drier ground. The 5-pot Burnet had a wingspan of 35mm.

Five-spot Burnet TL

When the Five-spot Burnet is active