An EU flag is waves as Britain's opposition Labour Party Leader Jeremy Corbyn delivers his keynote speech at the Labour Party Conference in Brighton, Britain, September 27, 2017. REUTERS/Toby Melville

BRIGHTON, England (Reuters) - A cliff-edge Brexit is at risk of becoming a reality under Prime Minister Theresa May, the leader of Britain’s main opposition party said on Wednesday, adding only Labour could win a good deal with the European Union.

“A cliff-edge Brexit is at risk of becoming a reality,” Jeremy Corbyn told hundreds of party members at the annual Labour conference in the southern English town of Brighton.