1&1 did a Debian Linux and Apache upgrade to their servers and in doing so, broke the php handling on their server, effectively knee-capping the site.
This is the message that came back today, after we lodged a support ticket with 1&1 earlier in the week to get the issue fixed...
"Our administrators have informed us that the current dedicated server you have, UK Dedicated Managed Server Value 1 (2008/08), was actually never intended to have support for PHP. Apparently there was a stable bug in the image design that allowed for PHP to be run, but however now that the debian upgrade has been performed the 'Value' servers are no longer able to support PHP. Additionally we no longer offer that tier of server anymore."
Huh? So Apache isn't a server php handler after all? I must have missed that meeting... O_o
We are working to get an alternative hosting solution sorted right now.
WotTheFook aka Merlin