I've been reading Gary Lanes's "Ideas behind the Modern Opening" in
which he recommends the London System for white. In the examples, white always seems to play the Kings bishop to d3 regardless of whether Black fiancettos on the King side or not. Except against the Kings Indian Defence when the Bishop always comes to e2 and I don't understand why.
Regards
Could you post the opening moves? I am not sure that I know what you are talking about. For me, the London System, a black reply to the Reti/Hypermoderns starts with 1.Nf3 d5 2.c4 c6 3.b3 Nf6 4.g3 Bf5. And getting the white kingside bishop to d3 doesn't seem obvious to me.
In the game Kamsky-Marcos, Timosoara 1988, the opening sequence went:-
1.d4 Nf6
2.Nf3 d5
3.Bf4 e6
4.e3 c5
5.c3 Nc6
6.Nbd2 Be7
7.Bd3 0-0
8.h3 Bd6
9.Ne5 Bxe5
10.dxe5 Nd7
The move 7.Bd3 centralises the white King's Bishop, allowing it to be deployed either side of the board. Should black challenge this piece with 7...c4, white will reply Bc2, keeping the long b2 h7 diagonal open. The point of the London Opening is that it is a complete opening repetoir for white and is quite flexible in it's move order. Try to obtain this book if you are seriously interested in learning it.
The London System by Andrew Soltis (ISBN 0-87568-231-6)
Sorry, I simply linked the 'modern' to the hypermodern/reti London system for black. As a white system (with the moves mentioned above) it is a typical system (as opposed to opening) where most moves can be made regardless of black's counterplay and with different move order. It resembles the Colle, but with the bishop brought out to f4 before closing it in with e3. The bishop on d3 helps the potential pawn push to e4 and makes Bf5 by black more difficult.