GOTHENBURG, Sweden (Reuters) - British Prime Minister Theresa May and European Council President Donald Tusk agreed on Friday there was more work to be done to advance Brexit talks and discussed ways to take further steps before December, a spokesman for May said. The two had  positive discussions  at a meeting on the sidelines of a summit in Gothenburg, Sweden, the spokesman said in a statement. May also met French President Emmanuel Macron.  Prime Minister May and President Tusk agreed that there is more work to be done and discussed how to take further steps forward together in advance of the European Council in December,  he added. 