The place of the image is one of London town’s museums, and I’d bet on Tate Modern. However, that’s merely a guess. Can’t recall, been so long since the picture was taken.
https://www.kramerw.com/2010/11/please-do-not-cross-the-line/
Like most museums, I’m sure there was – or is – a “no taking pictures” policy. No image of the art, but the floor board was intriguing.
There is a chance it’s in the Museum of London, which, in my mind, is one of the best museums in the world since it makes no effort to be everything to everybody. Just about London Town. History, fact, myth, archives, and stories.
Regrettably, that was that the best image. Rules, rules are just guidelines for stupid people.