Wall Brown

I went for a walk over on "the Marchon". It an old chemical factory site, 3000 people used to work here, now it's an industrial wasteland.
Despite the obvious contamination of the land nature finds a way.  Grasses, brambles, fireweed  and this pink plant finding a way to flourish. (Anyone know what it is?)
I go butterfly hunting here when it's no too windy and today I found a few species. I thought this was a Gatekeeper until I looked again. I believe it is a Wall Brown,  a new species for my collection this year.