Nearly 30 years ago when the RAF were developing an aerial farm on the disused RAF Chelverston airfield they were aproached by the contractor doubling the width of the A1 who wanted to buy the runways as hardcore. Due to the length of the runway and its unexpected depth of concrete (6 foot or so) the project was heading for a healthy PROFIT until it it was discovered that the removal of the runway had affected the water table and the transmitter hall was flooding. The cost of the resulting anti-flood measures meant that the end cost of the aerial farm was only a few thousand pounds.