David Cameron's speech on immigration in April 2011 — framing "mass immigration" as having placed "unsustainable pressure" on public services and articulating a target to reduce net migration to "the tens of thousands" from its then-level of around 250,000 annually — marked a significant shift in the rhetorical positioning of the Conservative Party on one of British politics' most consistently contested issues.

The speech came less than a year into the Conservative-Liberal Democrat coalition government and signaled that Cameron intended to compete with UKIP and the eurosceptic wing of his own party on immigration rather than cede that terrain to them. The "tens of thousands" target — which the government never came close to meeting during its tenure — would haunt Cameron's political legacy as one of the most conspicuously broken political promises of the era.

The policy context was complex. Student visa restrictions, limits on non-EU skilled worker visas, and tightened family reunification rules were all enacted with varying degrees of success at reducing numbers. But the largest component of UK immigration — from other EU member states, which the UK was treaty-bound to permit under freedom of movement — was entirely outside the government's direct control as long as Britain remained in the EU.

Cameron's rhetorical positioning on immigration, combined with his promise of an in-or-out referendum to manage his party's internal divisions, created a trajectory that his own political calculations would eventually be unable to control. The referendum he promised to prevent UKIP defections would eventually deliver a result he campaigned against, ending his premiership.

In April 2011, that denouement was five years away. The speech was a statement of political ambition whose consequences its author could not yet see.