These are a group of dancers which originally started off with Bill Whelan and went their own way. They competed recently at the Munich Feis (2003) under Sean Kilkenny - and where able to take home medals. The trainer is brought in on a workshop basis.
The website blicks a lot but has some information about other groups in Berlin. Related groups are the Capital Dancers http://www.capital-dancers.de (workshops with Sean Kilkenny), Tanzschule S. Kupko http://www.dance.foru.de (it is not clear who gives the lessons here), Crazy Taps - Tanzschule Sven Göttlicher (Lead american tap dancer in the show Magic of the Dance???), The Fiddele Hotsteppers.
There does not appear to be a resident teacher for these groups at the moment.