During her quarrel with Margaret, Yvonne accuses her of humiliating her husband (after he has endorsed Argyll socks for a print advert) by "forcing him to shill for a firm making mass-produced socks". "Shill" is, in this context, an Americanism which is rare enough in Britain in the 21st century and which would certainly never have been used by an upper-middle-class Englishwoman talking to a duchess in the 1950s.