To atract costumers Iain Guthrie puts fake egg nest of an abadon osprey bird nest. The customers come to see the nests. They even spend the night. At the bace Harrison goes on vacation an asppry bird has nested in one of the radar dishes. Airman Tench is commanded to get rid of the radar dish opstruction. Wing-Commander finds spy claiming to be a bird watcher. The spy ends up to be only a bird watcher. She tells Stokes that they must protect the nest. Later Tench is to guard the nest and protect it even from kittens. Tench shoot and misses the kitten scarring the bird away. Next day The bird watchers goes nuts when they find asppry bird at the nest surprizing Iain. (thetvdb.com)