I find the title of this book rather misleading as it is not about the military invasion plans for Britain, instead it is a handbook for future Nazi administrators of Britain attempting to explain how the country is run. What you get is a badly written account of the administative structure of the country, police force, county councils etc, a potted history of the Anglican church and its heirarchy, a list of major industries and companies. It reads like a series of encyclopaedia articles stitched together, indeed the Encyclopaedia Britannica with the Picture Post and evidence from two British agents captured in Holland are the sources for the supposedly revelatory section on the secret service. The only real interest is to show just how little the Nazis really knew about the inner workings of Britain in 1940. The second section of the book is a long list of people to be detained as soon as the invasion was completed, the vast majority of whom you will not have heard of. This may be invaluable reading for serious historians but I would recommend the general reader steer well clear.