21 November 2013

We are currently receiving high volumes of traffic following an upgrade to Visa4UK, our online visa applications system. As a result, you may experience problems accessing the new Visa4UK website.

If you need a visa in a genuine emergency, please contact your local visa application centre who will be able to assist you.

If you have recently completed a visa application on the old Visa4UK website and want to view it and, or print it, please see the Visa4UK legacy page.

Please continue to monitor this website for any further updates.

We apologise for any inconvenience this will cause you

Source:-
http://www.ukba.homeoffice.gov.uk/si.../48-it-visa4uk