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The helicopter tour was a Christmas present which came via a voucher. More details: http://www.adventure001.com/activity.asp?ActTypeId=6&Dn=Helicopter%20Sightseeing
A bonus was the location of the helicopter landing field – just across the road from the site of the Kelvedon Hatch secret nuclear bunker. This unassuming bungalow, shrouded by trees (left), is the portal to an underground world of reinforced tunnels and rooms where up to 600 military and civilian personnel, possibly even the Prime Minister, would have headed survival operations in the advent of a nuclear war. It was decomissioned in 1992, and is now owned and looked after privately. I didn’t have time to go in, but tours are available. There's even a cafeteria. See http://www.secretnuclearbunker.com/index.html