Unknown butterfly

This is a fall back blip. The weather forecast suggested that there would be clear skies in the evening, and indeed on my after tea cycle the skies were pretty clear, so I was intending to have a go at some star trail photography again. But by dark it was cloudy again :(

So here is a blip of a butterfly that I saw in the roadside verge while I was out cycling, but I'm not sure what sort it is as I couldn't see a similar looking one on the website which I have been using as my butterfly reference. Any ideas?