The “star” of this BBC children’s show was a huge yellow mainframe computer known as ‘Chockablock’. The computer was “chock-a-block” with words and pictures and would dispense knowledge through its array of monitors amid a flurry of spinning tape reels and flashing lights.
Chockablock was maintained alternately by Chockagirl (Carol Leader) and Chockabloke (Fred Harris), who travelled in a miniature yellow electric-powered ‘chockatruck’. Both presenters had previously appeared on Play School – as their ever-smiling faces and sing-song delivery demonstrated.
To activate Chockablock, his attendants had to take a block from the ‘block stock’ and insert it into the block slot of the computer
