I believe there is a false positive from AVAST Network Shield for www.newton.co.uk
I have checked the url through urlvoid, virustotal, google and many other services and they all report a clean site.
As the webmaster of this site, I am keen to know why this site has been attributed as a malicious url (for if there are reasons I will need to resolve them), and if it is confirmed as a false positive then I would like to know how this url can be removed (quickly!)
Send an email to virus (at) avast (dot) com with Possible False Positive - Network Shield in the Subject and the Info (URLVoid, etc.) in the Body of the email including the URL.