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The popularity of ?€?soda taxes?€? as a public health policy has grown rapidly in the last few years, offering what appears to be a ?€?simple?€? solution to a ?€?complex?€? problem. While the evidence suggests that a tax is associated with reducing the purchases of sugar-sweetened beverages, there are a number of questions that remain, including: understanding possible spill-over effects across the food system, the mechanisms for behaviour change (how much of the effect is actually price versus other effects), extensions to tax policies beyond ?€?soda?€?, importance of changed product composition versus overall consumption. In this presentation, I will outline research we have conducted in the UK over the last few years that cover these (and other) areas, including our current evaluation of the UK?€?s ?€?soda tax?€?, the ?€?sugar drinks industry levy?€?.