They wrote: 'Contrary to their on-screen appearance, the characters were huge: Tinky Winky was 10 ft tall, Po was 6 feet 6 inches, Laa-Laa was 6 ft 5 inches, and Dipsy was 8 ft. 'To make them appear small, the show was filmed on a massive set in Wimpstone, Warwickshire, which was kept secret for a long time'.
