 Complete the following phrase:  On October 7, 2016, there was a flash crash in the value of sterling, which dropped more than 6 in two minutes against the US dollar. It was the pounds lowest level against the dollar since May 1985. The pound recovered much of its value in the next few minutes, but ended down on the days trading, most likely due to market concerns about the impact of a hard Brexita more complete break with the European Union following Britains Leave 