Its the only way to be sure ! https://www.youtube.com/watch?...
Hi. If you're reasonably technically able the Sophos UTM has a great web filtering system and is free for home use. This can protect your whole network as well.
How about these they have drawbacks but would have alerted you more quickly http://www.thetileapp.com/
I think that our Chancellor http://en.wikipedia.org/wiki/Chancellor_of_the_Exchequer could do with a few !!