Marks & Spencer’s Curiously Strong Mints are just Altoids aren’t they? Altoids, although made in the UK (by Wrigleys), are notoriously hard to find here, whereas M&S mints are, well, pretty easy to get. They also tend to be about 6p more expensive.
They both have nice and awfully useful tins though, which makes them much better to get than, say, Trebor’s Extra Strong Mints.
Now I just need to peel back the UK label to see what’s underneath.