Sterling slid to a three-year low against the euro and a three-month low versus the dollar on Monday, after a March deadline was set for the start of the formal process that will split Britain from the European Union, Reuters reported. Britain's Prime Minister Theresa May told her Conservative party's annual conference on Sunday that she was determined to move on with the process and win the "right deal", in a move to ease fears inside her party that she may delay the divorce. Triggering Article 50 of the EU's Lisbon Treaty will give Britain a two-year period to clinch one of the most complex deals in Europe since World War Two, and will redefine the country's ties with its biggest trading partner. Sterling, having just posted its worst run of quarterly losses since 1984, skidded more than 1 percent against the dollar to $1.2845. That left it less than half a cent away from the 31-year low it plumbed in early July, shortly after the shock June 23 vote to leave the EU. The pound also shed 1 percent against the euro to hit 87.48 pence, its weakest since August 2013.