I don't know if the mirror website is compliant, it depends what cookies they are actually placing. As I understand it, under the new UK law, Google Analytics is classed as a Category 2 (performance) cookie, and is not essential for the functioning of the site, so cannot be classified as an exception. The civicuk site link that you posted works in a similar way to our own www.lg-legal.com
- the user must explicitly accept cookies.
We are considering just placing the Analytics cookie and making a link in our cookies policy page to turn Google off. I am not completely sure this is compliant though, and so I am interested to know other Sitefinity users' experience of this..