The price is not inclusive of VAT and no mention of it until you pay and has no VAT number. This price should not be advertised to the public without inclusive VAT. Trading Standards would be interested. Beware!
It might be good but I don't pay anyone additional VAT unless it's mentioned and they are entitled to it with a registration number and/or it is included, that's the rules. I upset a solicitor once who tried to charge VAT without doing this. Ooophs, how good was he?
Can I suggest that if you want to make use of lacunas in the law, don't purchase a crappy con book like this that is probably out of date. Get hold of a copy of something like 'Butterworths Police Law' - explains what the law is, how it should be applied and how not to apply it - You can make use of this information as you see fit - I can guarantee that the information will be far better, and be in much greater detail.