Extract from Comfort and Joy by India Knight

It's December 23rd, and Carla and husband Sam are hosting a pre-Christmas dinner party. Guests include Sam's mother Pat, silver fox Jake and his much younger girlfriend Tamsin, man-hungry but hopeless Hope, and smug Tim and Sophie, parents of their daughter's schoolfriend. "We make our own yogurt," says Tim, quite slurrily, from across the table. "Well, Soph does." "Why?" says Tamsin.