The book is structured as a series of encounters between german and english writers, philosophers, cars, football-players, artists, comedians, and political activists, interspersed with autobiographical narrative of the author's transition into english life, aged 17.
I recommend a look at the table of contents, which will give you the structure and the themes very efficiently. What it won't get across, however, is that it's funny.
I think the chapter I like most is "Theodor Adorno doesn't do the jitterbug with A.J. Ayer". This is the first time I have ever seen a german admit that some famous german philosophers are not just difficult to understand, they are *deliberately* difficult to understand. The contrast with the more limited aims and more clearly-stated positions of english philosophy.
But "Astrid Proll wishes she wasn't on Joe Strummer's T-Shirt" is very good too.
There's very little on the nazis, just a short reference to Unity Mitford in the Epilogue. (That was another thing I liked about it)