I'm mystified.
If you want a simple test however, take your laptop to somewhere where there's free wi-fi (J D Wetherspoon, larger Asda and Tesco stores, etc, etc) and try again. If you don't get the same message you'll know that it's related to your IP address. (If you do see it, try clearing your browser's cache & cookies to see if that makes a difference).
At home, try changing your IP address by:
a) disconnecting your router, waiting a short while, and then reconnecting it ; and/or
b) using your browser's settings to use a free proxy, chosen from here:
http://nntime.com/ ; and/or
c) using the Tor network:
https://www.torproject.org/ ; and/or
d) using a VPN:
http://www.pcadvisor.co.uk/test-centre/internet/best-free-vpn-services-of-2015-in-uk-3613860/
(Remember that changing your DNS doesn't change your IP address. Use
http://whatismyipaddress.com/ to check your [apparent] IP address)