In the days before Yorkie Bars - there were the Cadbury Bourneville Fruit (dark chocolate with raisins) and the blocks of "Tiffin", each 5 bars to the tin. I remember when I was an air cadet on my first hill walking exped (in Easter 1969), sitting outside a café in the Peak District and opening a tin (with the little can opener) much to the amusement of the locals.