NORMAN'S LETTER by Gavin Lambert. 232 pages. Coward-McCann. $5.50.
Biology says that the longer the nurturing period, the higher the species of animal. The quirks in that idea appeal to British-born Novelist Gavin Lambert. He first explored protracted puberty among starlets in Inside Daisy Clover, a barbed novel that Hollywood made into a mushy movie. Now Lambert satirizes the upper-class British male, alternately pampered and scourged in nursery and public school. His hero, Sir Norman Lightwood, is the invincible innocent, a descendant of Paul Pennyfeather who goes unarmed in a world of "pimps and...