Pretty sure it was a British UFO Children's Film. Saw it in about 1968 or 69, Black/White on TV. All I can remember is you see this UFO glowing land in a copse/forest of trees from a distance. Has a sort of George Pal glow effect to it. Children see this at a distance and investigate. Find this saucer (which looked like a glowing plate and about that size) in the fork of a tree. I assume they befriended it. Anyone?