Street photography is hard! Those guys spotted me on my second photo of them and started waiving and laughing. They are having lunch in what is left of St Dunstan-in-the-East church. It's a very picturesque place if not for sandwiches chewing crowds. I have to go there again earlier in the morning.
P.S. I was inspired by this photo: http://365project.org/melissachi/365/2011-05-17
Thank you, Melissa!