The "ground-breaking" sugar tax on soft drinks has come into force in the UK.
From Friday manufacturers have to pay a levy on the high-sugar drinks they sell.
Ministers and campaigners believe it has already proved to be a success with many firms reducing sugar content ahead of the change. But others say it is still too early to judge the impact.
Leading brands such as Fanta, Ribena and Lucozade have cut the sugar content of drinks, but Coca-Cola has not.
The introduction of the levy means the UK joins a small handful of nations, including Mexico, France and Norway, which have introduced similar taxes.