Posted: 01/06/2014 at 17:30
That's brill Jim
I've never seen an orange tip before at least not a male...
Sow some Lady's Smock (Cuckoo flower) Cardamine pratensis. That's their main food plant. And they obviously like Dame's Violet flowers.
I've inserted the video link already I hope it works, I'm taking the dogs out to see if we can see some more.