WWII emplacements as a battle training area
Boyton from Google Earth
http://maps.google.co.uk/maps?q=felixstowe&hl=en&ll=52.069588,1.488304&spn=0.045268,0.1684&gl=uk&t=h&z=13&vpsrc=6
A Romney Hut at Boyton, these were designed to house small aircraft in WWII but being on marshland I doubt whether any aircraft operated from here
http://pillboxesinsuffolk.blogspot.co.uk/2010/09/boyton-afv-range.html?