All web sites stop working, well all the ones I have tried. OpenDNS servers were set on my speedtouch router so all devices were affected. Switched back to O2's primary DNS server and have Google DNS (8.8.8.8) as secondary now.
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Might switch back to OpenDNS again now as I know they are working atm and see what happens. Don't really like the idea of Google knowing everything I search for plus every DNS request I make.