Hi Andy after giving up on TalkTalk taking any interest in sorting this out. I have discovered a way of blocking the majority of the filth on the web.If you go to Cleanbrowsing.org it takes you through it.
Log into your Router (by putting 192.168.1.1 in the address bar you can access your router got this from TalkTalk site) the sign in details are under the removable password tab on the router.
Once into the router go to Dashboard - See Internet Settings - Manage Advanced Settings - TalkTalk WiFi Hub - then the DNS tab
In the DNS tab change the settings to the ones given on Cleanbrowsing.org
18.104.22.168 put it in on both spaces as it wont let you leave one blank. and save.
I then tried searching for inappropriate websites and all are blocked that I clicked on.
Hopefully a temporary fix until TalkTalk sort it out for you
Let me know how you get on. Cheers Scott
It does block other things but its just a temporary fix to keep the kids safe. I think given the length of time and responses Ive had from TalkTalk they have little interest in sorting this out so I'm leaving them to it. Good luck getting yours sorted. Cheers Scott