Sterling took a tumble on Tuesday amid news that Prime Minister Boris Johnson plans to add a clause to the Brexit bill making it illegal to extend the transition period beyond the end of next year, reviving the threat of a no-deal Brexit.
Sterling came under pressure on Wednesday after a widely-followed opinion poll predicted the Conservatives would win the General Election with a significantly smaller majority than initially expected.
Sterling hit a seven-month high against the dollar on Wednesday as the Conservatives continued to lead the polls in the run-up to the general election next week.