This came in in the 1960’s, and had an advertising strap of “I like a man who likes me enough to buy me Cadbury’s Contrast. “. I do remember this, honest, but what was it?
The best I can remember was that it was a box of chocolates , closely resembling the Cadbury’s Milk Tray. But the chocolate was a plain and milk chocolate mix, hence the contrast. I thought it was great idea, but then I would eat all the milk ones.