London has a rich history going back to the Staunton era. Here we see the adventurous Julian Hodgson taking on John Emms in London 1992 in just one example of the spirited Trompowsky Opening.
l. d4 Nf6 2. Bg5 Ne4 3. h4!? Certainly this is a square count mind-set move.
3. … c5 4. d5 d6 5. Qd3!? Another example of utilizing the Q directly effecting mobility.
5. … Bf5 6. g4 Bg6 A sharp intrigue comes about with 6…N:f2 7. Q:f5 N:h8 8. Qf3 with the idea of trapping the Knight .
7. h5 Qa5+ 8. Bd2 N:d2 9. Q:d2 Q:d2+ 10. N:d2 B:c2 11. b3! And both have chances for interesting chess play.
This variation (of which there are many in the Trompowsky) will hopefully trigger the desire to explore h4. I feel it leads to opening ideas where square count can play a role. By exploring this theme in your own games and with home analysis and plenty of practice play, you should reap some rewards coming from a host of constructive work.