5..b6 against the London is supposed to be bad because of 6.Nc3! unless there is something new for Black...

@nestor, thanks a lot! That's very helpful! I might buy the book then. It looks like a nice repertoire.

The recommended lines tend to delay ...d5 until there is a specific reason to play it.

So in the Tromp, Davies starts with 1.d4 Nf6 2.Bg5 e6 3.e4 h6 4.Bxf6 Qxf6, and now for example:
5.c3 d6 6.Bd3 g6 7.Ne2 e5; and similarly
5.Nf3 d6 6.Nc3 g6; but by contrast
5.Nc3 Bb4 6.Qd3 d5 7.e5 Qd8.

(As in the Nimzo and QID chapters, these are quite demanding choices. In principle, Black's two bishops versus White's space and initiative are very reasonable trade-offs. in practice, those of us who were roughly contemporary with Julian Hodgson learned very quickly that his initiative would checkmate you before you got to enjoy your bishop pair in the endgame!)

OK here goes...

The main Nimzo lines are

4.Qc2 Nc6 5.Nf3 d6

4.e3 OO 5.Bd3 d5 6.Nf3 b6 7.OO Bb7 8.cxd5 exd5
4.e3 OO 5.Nge2 d5 6.a3 Be7 and similar, with the main theme of developing with d5, b6 and Bb7 and avoiding Bxc3. The Hubner is not the repertoire recommendation; there is one place where a Hubner-type solution is given for one specific move order (see below). This chapter also gives games with the delayed Samisch move orders 4.e3 OO 5.a3 and 4.e3 OO 5.Bd3 d5 6.a3 and Davies points out the differences these move orders make.

4.a3 Bxc3+ 5.bxc3 b6 6.f3 Ba6 7.e4 Nc6

4.f3 c5

4.Bg5 h6 5.Bh4 c5 6.d5 Bxc3+ 7.bxc3 d6 8.e3 e5

4.Nf3 c5 5.g3 Nc6 6.Bg2 Ne4
4.Nf3 c5 5.e3 Bxc3+ - this is the Hubner-type solution to a specific move-order, as the repertoire is 4.e3 OO.

Minor lines are also covered with normal replies.

The main Queen's Indian lines are

4.g3 Bb7 5.Bg2 Be7 6.OO OO 7.Nc3 Na6 and 7.d5 Na6

4.a3 Bb7 5.Nc3 Ne4 (and so also 4.Nc3 Bb7 5.a3 Ne4)

4.e3 c5 5.Nc3 d6

Again, minor lines are covered with normal replies.

Against 1.d4 Nf6 2.c4 e6 3.g3 he gives 3...c5 and goes into the fianchetto Benoni.

Normal lines are given against the Tromp, Torre, London etc.

Against 1.Nf3 Nf6 2.c4 e6 he gives 3.Nc3 Bb4 and 3.g3 a6 4.Bg2 b5.

In the English he prefers to avoid 1.c4 Nf6 2.Nc3 e6 3.e4 for Black, so the repertoire is 1.c4 e5 2.Nc3 Bb4 and 1.c4 e5 2.g3 Nf6 3.Bg2 c6.

Many of these repertoire choices are deliberately quite demanding, so as to provide unbalanced positions with decent winning chances. Davies has identified and discussed all of the move order issues I looked for, but I haven't had the book for very long, so don't shoot me if I haven't mentioned a point of concern to you in the above summary.

It's on my list for Santa !

I'm now a bit curious as to whether he addresses 1. d4 Nf6 2. c4 e6 3. Nf3 b6 4. g3 Bb7 5. Bg2 Be7 6. 0-0 0-0 7. Nc3 Na6 8. Ne5 d5, transposing to a line which goes back to the 1970s.  (It was played by Robert Byrne in '76, and by Karpov and Tal in '77.)