Resembling nothing more than a vehicle from Captain Scarlet And The Mysterons redesigned by Clive Sinclair, Big Trak was controlled, as the presenters of Tomorrow’s World breathlessly related, by that all-important “silicon chip”. With just a few taps on the keypad, this fully programmable beast could be instructed to move and turn in different directions, fire up its “photon cannon”, and make a couple of modish electronic noises. It was, of course, mainly used to frighten the family pet.