Do I really need to bother with SPF when the weather's rubbish?

Mariella Frostrup has all the advice on SPF - even when it's raining and you're desperate to feel the sun on your skin

Do I really need to bother with SPF when the weather's rubbish?
Mariella Frostrup has all the advice on SPF - even when it's raining and you're desperate to feel the sun on your skin