As divorce lawyers enter their busiest season, how sustainable is modern marriage? Plenty of couples never bother to formally marry, and the rate of break-ups in those who do has been rising. Does the model of lifelong partnership, sanctioned by law, work in an era of constant choice about everything from mobile phones to relationships? Are permanent couples the happiest form of human interaction? Phil and Roger get guidance from Dr Veronica Lamarche, senior psychology lecturer at the University of Essex.

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