TheRegister.co.uk has been hacked by Turkish hackers. September 4th is world hackers day.
http://i55.tinypic.com/10pc5u1.png
http://forums.digitalspy.co.uk/showthread.php?t=1528609
http://theregister.co.uk
Seems to be the DNS provider then
Quote from betfair
"It appears that the company who provide DNS services to betfair has been hacked. This means that a malicious user has been able to point the name 'www.betfair.com' to one of their own servers, presenting a splash page. The Betfair site (infrastructure) itself is unaffected, but until we can correct this DNS issue at the network provider's side, our users will experience this redirection to the wrong page. We are working with them on this issue.
There appear to be several other companies affected (Dell, UPS) - those who use the same DNS provider. We don't have any reason to believe that this attack is targeted specifically at betfair, or that there is any reason for betfair customers to fear for the safety of their data. However, if you wish us to suspend your account temporarily at this time, we are able to do so."