This lovely story was mentioned on another thread a good while ago, but I can't find it. It got a good response back then as, like me, many of you had been touched by it. Also, like me, some of you had tried to find it both on audio and video without success.
I've just discovered the original short film from 1971, starring Richard Harris and Jenny Agutter, on YouTube.
It's every bit as beautiful as I remember it. The last scene would bring a tear to a glass eye.