Oh bloody hell, I think that One Summer is something I saw as a kid and has haunted me for thirty years! I may have to pick that up, thanks for that!
Yes, I remember Chocky. And Children of the Dog Star (mid 80s NZ sci-fi show). The 80s Little Vampire, of course, which I still absolutely adore. For a long time (up to the late 00s) all I had of that was the first book it was based on, that actually has a cover featuring the TV show actors. That was the only proof I had of the thing's existence, even in the early 00s I couldn't even find it on the net, not even on Michael Gough career biographies when I was sure he was in it!