British support for leaving the European Union in a June 23 referendum has risen, giving the Out campaign a lead of 2 to 4 percentage points, according to opinion polls by TNS and YouGov.

A YouGov online poll of 3,495 people for ITV's Good Morning Britain showed 45 percent would opt to leave the EU while 41 percent would opt to stay while 11 percent of voters were undecided. The poll was carried out on June 1-3.

A TNS online poll of 1,213 people showed 43 percent would vote to leave, 41 percent would vote to stay and 16 percent were undecided. The TNS poll was carried out May 19-23 but adjusted for turnout.

Sterling fell 1 percent against the dollar to hit a three-week low today, while the cost of hedging against swings over the coming month traded at its highest since early 2009 on growing concerns over whether Britain will stay in the European Union.

Against the dollar, sterling was 1 percent lower at $1.4370, having fallen to $1.4352 GBP=D4 in early Asian trading, its lowest in three weeks. The euro was 0.75 percent higher at 78.95 pence EURGBP=D4.

Sterling fell sharply last Tuesday when both an online and a telephone poll for ICM showed a 3-percentage-point lead for the "Leave" campaign

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