With warnings about climate change and the recent heatwave fresh in our memory, we take a deep dive into the science behind sunscreen and debunk some of the claims made by some products available on shelves up and down the country.

In this Which? Investigation as we take a look at our own tests which show not all products provide the protection you’d expect, while we also hear about early research which could prove how our fragile ecosystem could be harmed by some of the chemicals meant to help protect our skin.

Read more about our mineral sunscreen tests or check out our sunscreen reviews (subscription required).