Sorry Blip. I had to do it.

This is an unsanctioned (i'm sure) picture of my TV screen which may or may not be something Blip would be happy about, but I have never seen a butterfly like this and I need help identifying it.

I was watching The Great British Baking Show, I believe Season 7 or 8.  At the very beginning of the program scenes are shown where the tent is located.  I think it's Welford Park, Berkshire.  As they're showing the grounds, various flowers and insects are featured and that's where this butterfly shows up.   I'm hoping some of my British Blip Friends can identify it for me since there's nothing like it in Northwest Washington State that I know of.  It has to be one of the most spectacular butterflies I've ever seen.  

I'm going to stop back-blipping so the picture stays as my thumbnail for a day or two in the hopes that somebody will spot it and ID it for me.