Conservationists say they have to be a “bit more inventive” to track the population of a butterfly which is the only one of its kind in England.

The mountain ringlet is only found high up in the mountains of the Lake District in Cumbria, according to ecologist Dr Rosa Menendez at Lancaster University.

Due to the remote location, and the fact they only fly for three weeks in the summer, Menendez said setting up multiple walks to count mountain ringlets in the peaks could be “quite demanding”.