Bowling Zero
SPECIAL DUTIES ZERO STATION
This is not an air raid shelter, it is a Zero Station, it would have been used as a hideout for the Special Duties Organisation during the Second World War. The Special Duties Organisation’s role involved radio communications and spying. Wikipedia – The Auxiliary Units or GHQ Auxiliary Units were specially trained, highly secret units created by the United Kingdom government during the Second World War, with the aim of resisting any eventual occupation of the United Kingdom by Nazi Germany, after a planned invasion which the Germans codenamed Operation Sea Lion.
This website goes in to a lot more detail about the station coleshillhouse
Now the only way in is now the 17 metre long escape tunnel. It leads to 3 rooms. Below are a few more snaps from inside.
This may give a clue to the area its in!