The old Basildon seat was abolished in the 2010 general election, and she stood for and lost the contest to the new South Basildon and East Thurrock constituency, which predominantly covered much of the area she represented in Parliament, to the Conservative candidate Stephen Metcalfe. Adverse boundary changes contributed to her defeat, as some of her voters were moved into the new Basildon and Billericay seat, whilst the new South Basildon seat took in strong Conservative wards in East Thurrock. Labour would have possibly held the old Basildon seat, and Smith herself said in a 2011 House of Lords debate: “Prior to my election to the other place in 1997, the constituency boundaries in my constituency were redrawn. For the 2010 election, the constituency boundaries were redrawn again, which may explain why I am in your Lordships' House and not in the other place”.