The Londoner says, "We don't have much respect for the Dutch".
London System, Queenside castle and you could throw in the g pawn gambit if you really wanted to. You're not going to be playing e4 in the London for quite sometime anyway, and the Dutch is to prevent e4. The King is weak in the Dutch which compensates for the queenside castling and the g pawn gambit gives a bit of activity and compensation to exploit the weak King.
I play queens gambit and I would like to know how to play against the Dutch defence and what the plans are.