The talks are due to continue until Friday, when a meeting is scheduled between chief negotiators Michel Barnier and David Frost. They want to reach an agreement by the end of October, but there has been very little narrowing of differences on the three thorniest issues - fishing rights, public aid, and the governance of the agreement - since talks began in March. Barnier and Frost say an agreement must be reached before October 15, the date of an EU summit in Brussels, so that it can be approved before next year.