Film ID: YFA 3999 KIT KAT, BLUE RIBAND AND BREAKAWAY 1970s Visitor TabsDescription The original four-finger version of the bar was developed after a worker at the Rowntree's factory, York put a suggestion in the recommendation box for a snack that a "man could have in his lunch box for work". The product was launched in September 1935 in the UK as Rowntree's Chocolate Crisp, and the later two-finger version was launched on May 15, 1936. Rowntree's Chocolate Crisp was renamed Kit Kat Chocolate Crisp in 1937, and after World War II just Kit Kat. The following advertizements include the slogan, "Have a break… have a Kit Kat." A series of 10 adverts for Kit Kat, Blue Riband and Breakaway, all untitled.