The UK Council for Child Internet Safety promotes the Click Clever, Click Safe code: Zip it, Block it, Flag it, which is a useful tool for parents, and teacher to teach their children about the basics of keeping safe online.
There are also other resources that CARE is happy to recommend. This years Safer Internet Day has plenty of information.
Why not check their website out at Safer Internet:
CARE is a company limited by guarantee, registered in England and Wales (No 3481417) Registered as a Charity in England and Wales (No: 1066963) and in Scotland (SC038911) Registered office: 53 Romney Street, London, SW1P 3RF. CARE has no involvement with CARE International