The Butterfly Farm, Bexley, Kent. (NB: although this is a Butterfly Farm - this story is about moths)
Various C/Us of green and gold caterpillars or grubs moving along branches and eating leaves. Weeds are encouraged in this garden to encourage breeding of caterpillars - it is a moth farm. Mr L. Hugh Newman is the entomologist who breeds moths for export. L/S of Mr Newman placing a special box on top of a stepladder. He takes a twig out of the box and puts it into a special muslin bag known as a "sleeve" then wraps it up. This protects the caterpillars from birds and other enemies as they eat and grow. Mr Newman breeds rare species of moth. C/U of him tying the end of the "sleeve" with string.
M/S of a young boy looking at a plant with bright red flowers. There is a very large moth sitting on the plant. He stands on tiptoe to look at it. C/U of the moth - it is a giant silk moth called Ailanthus or "Tree of Heaven" and hails from China. Nice C/U of the boy looking at the moth. "You never saw one like this in the wardrobe!" quips the narrator (Eamonn / Eamon Andrews). C/Us of another silk moth - the Polyphemus or Giant Oak silk moth from America (sometimes called the Eyed Silk Moth). Two other species are shown in extreme C/U - Moon Moths from the Himalayas in India and the Canadian Bull's Eye moth.
M/S of Mr Newman and the young boy (presumably his son) in a workroom. Mr Newman is mounting some dead moths "so that their beauty is not lost". C/U of some dead moths in a box, Mr Newman picks one up with tweezers then arranges its wings to best effect. His son helps him. A Madagascar Moth (the most beautiful in the world) is picked up with tweezers and mounted in a box. C/U of a display case with various species of moth mounted in it - lines link them to a map of the world - presumably showing their original birthplace.
Note: some correspondence and information about the moth farm in documentation file.