How does Spark address the issue of class and class-consciousness?

Muriel Spark's major concern in The Ballad of Peckham Rye—as in many of the rest of her novels and short fiction—is the problem of class and class-consciousness and its effect on morality and the relations between the sexes. Though Spark has claimed not to be a very political writer, this novel nevertheless concentrates on the disastrous effects of class and economics on love and morality.