Welltown

http://www.welltown.gov.uk
Welltown is a lovely little site aimed at KS1 students. It explores all aspects of health; physical, mental and emotional. The site covers a lot of Science and PSHE material including healthy eating, physical activity, accidents, bullying, smoking and safety in the sun. As you'd expect there's also a full guide for teachers and parents to get the most out of the online material.