https://www.standard.co.uk/news/london/army-explosives-exper...
"The bomb is 10ft from my flat on the other side of a wall and I’ve had so many parties here if it was going to blow up, it would have done so by now."
"A guide on dealing with unexploded devices was released by the Construction Industry Research and Information Association (CIRIA) in 2009."
"An estimated 15,000 items, ranging from unexploded bombs to small mortar rounds and grenades, were removed from UK construction sites between 2006 and 2008, the association said"
[1] https://www.theguardian.com/uk-news/2017/jan/19/wwii-bomb-di...