Julian Knight is confused between the balance of payments and government accounts, stating that governments spending less than they earn will have a current account surplus. This is simply not the case and reflects either a sloppy, amateurish approach or a jaw dropping lack of understanding of rudimentary economics.
Also, though he does present austerity as a debated issue, he seems to do so only as a question of degree - how much austerity is right for recovery, rather than whether it is right at all. He does not state that many people feel austerity is fundamentally the wrong policy, and that governments should be adopting a Keynesian approach and spending more to stimulate growth. Whether one is pro or anti-austerity, the author of a primer book such as this has a duty to the reader to present both views (and even mention it is an ideologically charged issue, to give the reader a deeper political understanding).