A few houses round my way still had bomb shelters in the Garden in the 1980s and we had massive bomb craters down the road in a forest I used to walk my dog in.
It was and still is common for building works to be stopped and put on hold due to unexploded bombs being found.
I worked at Heathrow Terminal 5 when that was being build and the whole site was evacuated loads of times because of that.
This map below is pretty cool so if someone can repost the link as this site is still shit for mobile devices and the link won't be live posted straight from an iPhone

http://bombsight.org/#15/51.5050/-0.0900