A slope shaft is a quarry entrance, dug in to the ground at an incline. Often they include pedestrian access via steps as well as rails for a cart used to extract the quarry's product.
Brewers Yard Quarry - Brewers Yard Quarry has a very narrow slope shaft
Slope Shaft Photo - A photograph looking down a slope shaft
Box Quarry Fact Sheet - More details about underground quarrying
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Paddock was Winston Churchill's alternate Cabinet War Room bunker for World War II, constructed in 1939 but only visited once by the Prime Minister before it was abandoned in 1944.