Most folks here seem understandably to be sceptical about the forthcoming book. Why not contact the author/restaurant and warn them that he needs to be honest or we'll make sure the book is added to our list of snake oil claims. On the other hand, if the recipes work, then he should see a relative best seller because it will represent the breakthrough we seek. Even offer to help with the testing, which should surely take place, and provide an endorsement to support their marketing efforts.
Acid test - will a recipe cooked from that book, by a reasonable cook at home, taste virtually indistinguishable from the equivalent version at their restaurant in Birmingham?
Regards
George