Rainbow is a British children’s television series, created by Pamela Lonsdale, which ran between five times weekly, twice weekly and once weekly at 12:10 on Tuesdays and Fridays on the ITV network, from 16 October 1972 to 6 March 1992 (with repeated episodes only continuing to be shown until December 1992). It was intended to develop language and number skills for pre-school children, and went on to win the Society of Film and Television Arts Award for Best Children’s Programme in 1975.
The programme was originally conceived as a British equivalent of long-running American educational puppet series Sesame Street. The British series would be developed in house by Thames Television, and had no input from the Sesame Workshop.
After more than 1000 episodes, the series came to an abrupt end when Thames Television lost its ITV franchise at the end of 1992. Since then, it has gained cult status and continues to get frequent mentions on radio and television. – WIkipedia.