Well I just tried again and it says "We are sorry but the checker is unavailable at the moment. Please try later" as a red text message when you enter your details + capture code and hit enter! I should have been clear the page comes up OK but then this happens!
Stuart
I'm still getting exactly this, tried at work, and at home, and on my phone.
If I turn my phones wi-fi off it works, if I fire up a virtual machine and connect through a VPN, it works.
Is it possible they are blocking IP addresses which have used the service a little too much, not that I do many checks these days, especially from work?