Cadbury bars from the UK taste better than the ones from the US. They don't have the wax in them. You can get lots of great UK Cadbury and other UK chocolates in Canada or at the duty-free shop at the border. I love the "Flake" bars from Cadbury, which are milk chocolate, but usually I prefer dark chocolate otherwise. Lindt truffles get their creamy texture from palm kernal oil.
When I visited the States in 1997 I really noticed the difference in the taste of the chocolate from Britain.
Though many of your chocolate makers do the same type of bars - many of them made under licence the recipe or the ingredients are not quite the same.
I believe one of the things is with Cadbury's chocolate in Britain it is always made with liquid milk and many other manufacturers I believe use the dried variety.