Here's some candy bars commonly found in Canada that I really enjoy.
As the picture shows, this bar consists of whipped chocolate that sets with bubbles trapped in the chocolate, hence, "Aero". The bubbles create a lighter texture so that the bar is not too filling/heavy, and provide a distinct eating sensation compared with solid chocolate. The result is a scrumptious chocolate bar that quickly melts in your mouth.
These are similar to M&M's found in the US, but with a distinct flavor, as some "Smarties" already know. Like M&M's, Smarties are milk chocolate pieces covered with bright candy shells. There are eight vibrant colors.
This unique combination of light crispy wafers, bubbly coffee cream and milk chocolate coating satisfies without filling you up. This is the #1 selling candy bar in Canada.
I prefer Mint Aero to just chocolate aero, smarties I prefer to M & Ms we used to have chocolate treats instead of M & Ms but Mars decided that they wanted to make their sweets (candies) go by the same name in all countries so changed them to M & Ms. At the same time made them multi coloured they used to be just dark brown. They still do large version in dark brown called Minstrels.
Have you noticed in Smarties the orange one is actually orange flavour all the others are just milk chocolate.
Do not know Coffee Crisp never seen that in Britain.
Another interesting thing on names Snickers was another product that Mars decided they wanted to call the same name worldwide because in Britain it was Marathon.
I also believe that Milky Way in the States is what we call a Mars Bar whereas our Milky Way is very similar to your 3 musketeers.