The nature of cohabitation in the UK presents a rapidly changing landscape. This report provides an up-to-date analysis of cohabitation statistics, using the most recent British Household Panel Survey data. It shows that cohabitation is a less stable form of relationship today than it was 15 years ago and is generally short-lived. This is particularly pronounced for those couples with children. Contrary to popular opinion, cohabitation does not serve as a ‘trial marriage’ but instead significantly increases the odds of divorce.