Note the use of the standard WCK front kick (Is it a snap or thrust?)

In the first vid it's interesting to note what happens when the WCK guy tries a low round kick about half way through. This is not normally used in plain vanilla WCK, and this shows pretty clearly why not.
http://www.wingtzun-eschwege.de/kkb-spa ... %20048.avi
http://www.wingtzun-eschwege.de/kkb-spa ... %20049.avi
http://www.wingtzun-eschwege.de/kkb-spa ... %20051.avi
http://www.wingtzun-eschwege.de/kkb-spa ... %20052.avi