American M&M's in the UK A hugely popular American Candy invented in the 1930's as a way to stop chocolate pellets from melting, there is a hard sugar candy shell surrounding the chocolate. There are loads of different flavours, mint, pretzel, coconut, peanut butter (best seller), birthday cake, cinnamon, milk chocolate, dark chocolate, etc. You name it they've got it. They are massively popular, and sold in over 100 countries worldwide. They only came to the UK in the 80's, but there are a lot of flavours which aren't available here, and thus the USA M&M's are so popular in the UK.