Hi, just thought that with many of you going for your interviews soon, you may want to have a look at something I posted quite a long time ago right after my interviews. Some of the info may be outdated already, so pls don't take it all as the gospel truth. Still, I hope the basic info may be of some use. You can find the thread here.
http://www.pprune.org/forums/showthread.php?t=147640
or just search for the thread titled My SIA Interview Experience.