No four finger swipe on my UK machine either, even after a clean install from the "Macbook Air" OSX disks. On the bright side, I don't have the screen lines issue.
I tried the same re-install did not help. Seems we got the same build number of OS X as the US customers, so in my opinion this can ONLY be a hardware issue now
http://discussions.apple.com/thread.jspa?threadID=1787103&tstart=0 < Also the same issue, hope that Apple will give some sort of message to us buyers of the faulty non-us model