SUNSCREEN: YOU MAY NEED A BOTTLE A DAY

SUNSCREEN comes in different strengths and will block out varying degrees of the sun’s rays depending on its SPF number, a measure of the ability of a sunscreen to prevent sunburn. The sun’s UVB rays are the main cause of sunburn, so screens must protect against it.

‘Most people don’t apply sunscreens properly, underestimating how much and how often,’ says Professor Antony Young of King’s College London.

‘For an average-size woman spending a day on the beach, you need a 100ml bottle of sunscreen every day which is enough for three whole body applications at the right thickness to get the labelled SPF protection.’