If this were just a novelization of the film, I would have rated it three stars. However, it gets bonus points for anticipating Monty Python's surrealist moments, and for including the description of a scene filmed but cut from the final movie, with the boys taking acting lessons from a famous British dramatic coach (played by Frankie Howerd, who starred in Dick Lester's A FUNNY THING HAPPENED ON THE WAY TO THE FORUM and later in that awful SGT. PEPPER'S LONELY HEARTS CLUB BAND, with George Burns and Steve Martin slumming along with Peter Frampton and the Bee Gees. Ugh.)
Anyway, I bought it for a quarter at a book sale, and it's worth $25 or so. But I'll never sell it.