As some of you may have found, if you have a new install of FTB Unleashed or have recently upgraded, then you can't play on the CFUK server.
As Draze pointed out, even if you try and downgrade the mod pack via the versions menu, it doesn't actually downgrade the core mods - thus it will not work with the server.
I have uploaded a tweaked version of my working Unleashed folder to my webspace for windows 64-bit installs. I have no idea if it will work on 32-bit windows installs or on Mac OS, so please make sure you
back up your unleashed folder before installing mineSoul's files - This link will take you to a page with more specific details on it.
To find your FTB folder, simply right click on the launcher icon and select "Properties" - the "Target" location will tell you where your FTB install is.
If you have any problems / comments, please post them on here.