The protesters’ camp in Parliament Square was cleared last year, and the square has been fenced off since then. However, even now, there are a few tents on the pavement (sidewalk). Mr Johnson, London’s Mayor, is trying to evict Mr Haw as well (BBC: Bid to evict Brian Haw from Parliament Square).
Parliament Square is in Westminster, and therefore very close to Westminster Abbey, where the royal wedding will be taking place in the spring. On the back of one of the remaining structures erected by the protesters, there was a sign that stated William ❤ Kate, as seen towards the bottom of the photograph.