This may have already been covered as it happened in 2015 when a WWII unexploded bomb was discovered during digging on a building site on The Grange.
Recently dug up!
I have only just come across this article and when I realised exactly where the unexploded bomb was located it sent shivers up and down my backside This is the exact spot we played on when we were nippers on a Sunday afternoons with my mates! I think it was a disused tannery and to us scallywags it was our Disneyland! Even one of our mates lived on the junction of Grange Walk/The Grange right opposite the bomb. Imagine not knowing that we were all jumping up and down on a 1,000lb unexploded Jerry bomb.
Still you gotta have a Bermondsey sense of humour to laugh about it