I'm playing against him as black again in 7 minutes :) Let's see if he will play the London again.

I must say, I'm not 100% certain about the ...Bb7 system against London system, but I guess it would make sense for me if I had a Nimzo/Queens Indian kind of repertoire. I can speak from experience that a quick ...Nc6 and ...e5 at appropriate times usually messes up London System / Stonewall attack plans

London system never looked dangerous to me but in this game even if I didn't blunder, I ended up pretty bad after white's f3-e4-e5 advances. I should look at these games in Cox's book. Thanks for the comments, very helpful as always :)

John Cox (Dealing with d4 deviations) says of the London sytem "It would be silly not to be honest - this is not the sharpest opening chess has to offer. White's system is immensely solid and I'm afraid Black just doesn't have a sound aggressive option. These openings do exist: the only reaction really is to hunker down, recall the Russian mantra that it is easier to win from an equal position than a bad one, and resolve to make like Capablanca if necessary"

I've never really played London system as white, but I have often ventured the "Stonewall Attack" - sort of like a Dutch Defence reversed where you start with 1.d4 but play subsequent f4, e3, Bd3, Nbd2, Ngf3 and then O-O and launch a K-side attack. The people who smash my system easily have usually played for early ...e5. Usually this is preceded by ...Nc6

http://chesstempo.com/gamedb/game/473111/ply/11

However John Cox's book advocates a Queens Indian Defence sort of set-up and references:

Neuzil, Torey (1864) vs. Nepsen, Roland (2206) 2003 http://www.365chess.com/game.php?gid=39857, an internet blitz game by low ranking players
David Bronstein vs Alexey Vyzmanavin 1991 http://www.chessgames.com/perl/chessgame?gid=1035049
Milorad Knezevic vs Dragoljub Velimirovic 1978 http://www.chessgames.com/perl/chessgame?gid=1291345 which reaches London system positions by transposition

Gawd - whoever said the London system was a pushover, huh? Good game, though. I might have to dig up my anti-KID material.