I have this problem sometimes. I only have this with chrome. When you are having trouble loading a page it will sometimes load the page as that. No idea why, just does. I do not have the problem on Safari or Firefox. Reloading always fixes it.
I'm with Sky, but i'm switching to fibre optic with BT eventually. I think, anyway... And my internet has its bad days, and its good days. Mostly bad days. But today isn't a bad day *If you ever go with Sky Broadband, expect alot of bad days btw. They only own, I believe, 12% of their broadband. The other 88% is owned by several other companies*
I also always have this problem on my phone... (Internet speed: http://www.speedtest.net/my-result/a/721860646)
Most of the time my speed is around 8 Mb/s or less, however I rarely have problems with sky nowadays, I used to have loads, but for me, they've gotten a lot better.
But this internet is better than most of the UK's SpeedTest's details are wrong when it comes to their 'better/worse than'.