I got the the book today. I was laughing out loudly at his choice against the KID.
1.d4 Nf6 2.Nf3 g6 3.g3 Bg7 4.Bg2 0-0 5.0-0
6.a4 It doesnt mean I consider it bad but...this move feels a bit strange. Burgess also writes about this in his introduction of the KID chapter where he says that he understands that the reader will be suspicous of the move
6.a4. I think Gallagher had this idea in his book
101 attacking ideas. In the introduction of the book Burgess writes that the repertoire offers plenty of ropes for black to hang himself with

. Maybe the space gaining
6.a4 is such move which could make the do or die KID player to overpress his game.I leaves few targets in the center for black to attack. There is just one white pawn standing there in the center.
His repertoire :
QGD:
Bf4 system QGA:
Mannheim variation (4.Qa4+) Slav :
Slow slav (Nf3-e3) Semi-Slav :
g3 setup. Ragozin:
5.Qb3 Tarrasch:
8.Be3 Against
1.d4 Nf6 2.Nf3 e6 --Torre Attack (with Torre poison pawn if black goes for that).
KID: Counter fianchetto system with 6.a4
Grunfeld :The repertoire against the Grunfeld looks more normal with fianchetto setup with c4 included. Kingside is developed first.
Anti-Benoni :
1.d4 Nf6 2.Nf3 c5 d5.
1.d4 c5 2.d5 Dutch: Stonewall :
Nbd2 with Nh3. Leningrad :
4.c3 with 6.Nh3. All in all : After having speed readed the book it looks good. I may have to look deeper on the move 6.a4 in the KID.