It is incredibly concerning that some big brands failed our tests and did not offer the level of sun protection claimed on the packaging.
Our results prove that there's no need to splash out to keep you and your loved ones safe in the sun this summer, and that many of the supermarket own-brand products can do a good job.
Which? tested how much energy it took to redden the backs of volunteers exposed to rays from ultraviolet (UV) lamps, with and without sunscreen, and applied the lotions to glass plates to measure the amount of light they filtered.
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