The legion of Mitford/Waugh fans will be familiar with the affair explored in these delectable pages.
Trapped in marriage to shifty bore Peter Rodd, Nancy Mitford fell for former resistance leader Gaston Palewski.
Despite an unfortunate appearance, he was a babe killer incarnate. Intended conquest Virginia Forbes-Adam recalls him opening his door stark naked "in a state of considerable excitement".
No wonder Nancy coined the expression in the title but this worldly relationship worked. As Hilton notes, "Nancy decided that to elevate fidelity was…simply childish."