The house is just over a century, it's in a wealthy area of a decently old and fairly major English city.
I would have thought the structure would have had a more obvious entrance if an air raid shelter, but I guess that could have been above ground which was since removed.
Being a city of industry, the area did suffer bombing as part of the Blitz in WWII - there were garden air raid shelters locally, so it's not a bad shout. It's about 3 or 4 ft deep, like a meter or so in new money. The spade should give an idea of scale.
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