... Nottingham and Southampton
This page lists those Anderson shelters which were built in a non-standard way, or which have been adapted in some way, and which - perhaps as a result - have survived at least until recently.
This is a very characterful shelter, used as a composter and built into a hillside in Sherwood, near Nottingham, which is no doubt how it has survived to this day.
Here are external and internal photos before it was cleared.
And here is a photo taken after the area around the shelter had been cleared, plus close-ups of external features including a bolt and a hinge.
Graham and Lizzie Hendra found this shelter in 2016 after they had brought in a gardener to remove a mound of earth at the end of their garden. Their house in Glenfield Avenue was built in 1922 and they had lived there for six years before discovering the shelter. It looks to have been very well built. The concrete cap may have been added by a builder who wanted to ensure the safety of his family during the war. Their cat certainly appreciated having a new space to explore.
Sadly, this shelter has since been removed from this garden.