A very recent addition to the Cumbrian species list. It is probably one of the most common summer butterflies in more southern parts of the UK and there has been a good colony at Heysham Power Station in north Lancashire for several years. Singles were recorded at Beetham Fell and Whitbarrow in about 2003 indicating a spread northwards and at the same time several were recorded at Smardale Gill Nature Reserve indicating a spread from Durham in the East. Now it is more common at Smardale and in season you are highly likely to see it. From now on the spread of this species throughout Cumbria is likely to gather momentum.
Where to look
Smardale Gill CWT Nature Reserve near Kirkby Stephen, SD 729072 or Arnside Knott, SD 455774 in the field just to the right of the cattle grid as you head towards the car park.
When to look
Mid-June to the end of July