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The 'Flake' chocolate bar was first developed in 1920. An employee of Cadburys noted that when the excess from the molds used to create other chocolate bars was drained off, it fell off in a stream and created folded chocolate with flaking properties. In 1930, Cadbury started producing a smaller version of the standard Flake bar especially for ice cream cones. These were marketed under the name 99 Flake and sold loose in boxes rather than individually wrapped like the traditional Flake.
Bangers biscuits: your guide to translating British food slang