The picture shows a scarlet tiger moth (Callimorpha dominula) with its dotted forewings hiding scarlet hindwings.
The caterpillars live on comfrey, nettles, bramble, sallows, honeysuckle and meadowsweet. The adult often flies in sunshine. Many day-flying moths are brightly coloured; bright colours advertise their unpalatability.
This species is more common in the south-west and Wales.