Below are some link to websites which will help keep your children safe on the internet.
Know it all for parents: www.childnet.com/kia/parents
CEOP safety centre: http://www.ceop.police.uk/safety-centre/
Online Compass: http://www.onlinecompass.org.uk/about.aspx
Think you know : http://www.thinkuknow.co.uk/
There is a button on the front page of the website which will take you ot the Child Explotation and Online Protection Centre.
Below is a link to a software site that is recommended for parental control and filtering unwanted websites. There is a two week free trial but please be aware that there is an annual charge of £25.