Thor Launch Pad
Heard a similar story when the were demolishing the pads at Mepal a few years ago for new straw burning power station. Contractor did some serious and permanent damage to his JCB thingy with the pneumatic chisel on the end trying to break up said concrete. He won in the end and all that remains of the pads today is a section of concrete with the rails in them for the missile canopys.
However the Missile Control Cuilding still stands in an adjacent field as does some of the wartime WAAF blocks and the post war ROC bunker still exists on the other side of the airfield, now bisected by the A142.