A tip for those of you who suffer (as I used to) in the sun from Prickly heat - Mycil cream for athlete's foot (available in supermarkets and Boots) - once the prickly heat rash starts I get in the shade for the rest of the day and put this cream on; you'll find it gone within 24 hours. The back of the packet tells you it's suitable for 'Dobi's Itch' which is another term for Prickly heat :)