For two decades, Stefan Rousseau has spent much of his time travelling with and photographing the Prime Ministers of Great Britain as a photojournalist for PA Media. On the 22nd March 2017 he was within the grounds of parliament when a lone terrorist attacker struck. This is the story of a set of pictures Stefan made that day directly witnessing the aftermath of a terror attack in the heart of London. The show is supported by our patrons and MPB.com