Milk Tray is brand of boxed chocolates currently manufactured by Cadbury. Introduced by Cadbury UK in 1915, it is one of the longest running brands in the confectioner’s portfolio. Milk Tray is sold in Australia, parts of Canada (such as Newfoundland), Ireland, New Zealand, South Africa and the United Kingdom.

The name ‘Tray’ derived from the way in which the original assortment was delivered to the shops. Originally Milk Tray was packed in five and a half pound boxes, arranged on trays from which it was sold loose to customers.

In 1916 a half pound deep-lidded box was introduced with a purple background and gold script, which has undergone minor changes in the ninety years since it was introduced. In 1924 a one-pound box was introduced, and by the mid 1930s the Cadbury’s Milk Tray assortment was outselling all its competitors.

The pack design has been regularly updated and the assortment itself has changed in line with consumer preferences, and today it is still one of the most popular boxes of chocolates in the UK selling over 8 million boxes per annum.

Info gleaned from Wikipedia