The ruling Conservative Party extended its lead over the opposition Labour Party to 14 percentage points, up from 9 percentage points a week ago, an opinion poll by Survation for ITV's Good Morning Britain showed on Monday.
Sterling rose to as high as $1.3180, its highest level in seven months and was last up 0.25pc on the day.
The pound strengthened versus the euro to 83.94 pence , its strongest level in 2-1/2 years.
Expectations that the Conservative Party will win an outright majority in this week's election, ending a hung parliament and political paralysis on Brexit has boosted the pound in recent days.