Anderson Shelter in Watford
Here are two photos of a shelter in the garden of a 1920s house in Watford - somewhat neglected under previous owners, but recently discovered by new owners, still covered in soil. The shelter was forgotten about, and thankfully avoided being dug up, as it sat in a large gardens so there was no need to remove it to make space. It sits well into lower level ground with well established flowers and hedges on top so it is also not easily visible. Inside the condition is pretty good and there is no erosion in the structure.
The shelter is still being using used as a temporary store. However, the new owners hope eventually turn it into how it would have been during the war, complete with bunk beds, cabinet for tea etc.