Scotland introduced a sugar tax. As a result, many of the most popular products switched to sugar substitutes.

For example, Scotland is one of the few countries in the world where Coca-Cola is not the most popular fizzy drink. Irn Bru is.

Following the sugar tax, Irn Bru changed the recipe to use alternative sweeteners.

Some people complained, and there is an original version, but it is far more common to see the sugar free version used.

In this case, the tax works.