Bank of England policymaker Megan Greene said U.S. President Donald Trump's tariffs would probably lead to lower rather than higher inflation in Britain but big uncertainties remained about the plan and the impact of a recent UK tax hike for employers. "We have tariffs, and none of us have any idea what they'll look like when the dust finally settles," Greene said in a discussion with the Atlantic Council think tank on the sidelines of the International Monetary Fund's spring meeting.