The BBC are having a competition to find the greatest public information film ever made.
My money is on the one about water safety, where a sinister cowled figure tries to lure children into dangerous pools of stagnant water. I still have nightmares about him.
Think Bike is pretty good too. I tried to explain its magic to my beloved, but she grew up in Patriotic TV Land, so her idea of a good public information film is that "oh my achin' back" one or that one about how if you go deaf your life is over.