The group has been mobilising over the Christmas break in an effort to keep the boycott going. It was English teachers' opposition to the tests that triggered the two-year dispute.
Yesterday John Wilkes of the London Association for the Teaching of English said the rank and file were angry with the NUT general secretary, Doug McAvoy, for the way he has handled the affair. Mr McAvoy announced on almost the last day of term that he would hold a ballot in January.
Union leaders say they have won concessions from the Government. The Secretary of State for Education, Gillian Shephard, has agreed to evaluate the tests after talks with the NUT, which is the last classroom union refusing to conduct the tests.