Kamsky comes to mind, though he plays the London rarely these days. There was a time around 2007 (around his match with topalov) that he was collaborating with Yuri Shulman and playing the french quite a lot. He's also a big exponent of the a6 slav.

Happy New Year to every member!

With practice I am slowly getting to know myself and my preferences in chess...so I already have two questions for the new year.

Q1) What strong players have the London System as White, while the French as Black in their repertoire?
     I am going to check out how they react to 1.d4/c4/Nf3...

Q2) Please help me choose. As Black, there are two set-ups I most like vs. 1.d4:
     
     a) Nimzo-Indian & Bogo-Indian (when I prefer flexible center -- no early ..d5 in order to make the play more complex) and the accelerated 1..e6 2.c4 Bb4+
     (In my case, this goes with 1.c4 e5 (2.Nc3 Nf6) w/ early ..Bb4 and 1.Nf3 Nf6 2.c4 c5 3.Nc3/g3 b6; 3.d4 cxd4 4.Nxd4 b6. (I have a bigger aversion to 2.c4 e6 3.g3 and Catalan-style defence than I have to "a hedgehog in a hurry."))
     
     b) Slav w/ early ..a6
     When the fixed centre somehow makes me feel more secure. (an asset when playing much higher-rated opponents)
     (This means not so varied structures -- 1.c4 c6 2/3...d5, 1.Nf3 Nf6 2...d5 etc.)
     
     I can't decide how much emphasis I should give them (a and b) in my current opening-studies.
     For the time being, my first aim in chess (with few opportunities for practicing my openings in OTB-play): not to lose against any of the FM opponents I am going to encounter in team matches over the next months. 
     This, I think, speaks for b. I would just like to get some encouragement...