Midsummer butterflies spotted early in Britain after sunny spring

Scientists fear early emerging insects may fall out of sync with pathogens, predators or availability of food

Midsummer butterflies are on the wing in early May after a sunny spring prompted one of the most advanced seasons for Britain's Lepidoptera on record.

The Lulworth skipper - usually found in June and July - is flying at Lulworth Cove in Dorset, the chequered skipper emerged in April rather than mid-May in Scotland and the first swallowtail, which is most common in mid-June, was spotted in Norfolk on 1 May.