The IP address that BT are sending you to is their "BT Web Protect and BT Parental Controls" warning page. It has sensed that you are trying to get round their controls by using Google's DNS. Please use the undo command below and then paste another screenshot of the original error message.
Edit: Here's the "undo" command for the Virgin Media fix. It returns the RPi to its original settings.
Code: Select all
sudo sed -i 's/^name_servers=8.*/#name_servers=127.0.0.1/' /etc/resolvconf.conf
NOTE FOR OTHER USERS: Do not try the "Virgin Media fix" if BT is your ISP and you have web protect or parental controls enabled.