Well read this thread i can confirm as a Leon owner that this does indeed work and that the frequency does not matter.... have a read but i now have a working flip key.... my old key was a 433mhz, my new flip key is a 434 and works perfect.
As i say read up...
http://www.seatcupra.net/forums/showthread.php?t=102433&page=7&highlight=flip+key
As i say read up...
http://www.seatcupra.net/forums/showthread.php?t=102433&page=7&highlight=flip+key