The general secretary of the National Union of Teachers, 56, died at home on Saturday of a suspected heart attack.
Last week the union agreed its first national strike for 21 years. Its leaders said the walkout, planned for 24 April, would go ahead as mark of respect to Sinnott.
Prime Minister Gordon Brown described him as "inspirational". And shadow children's secretary Michael Gove said: "His natural enthusiasm for education and passionate advocacy for teachers made him an outstanding professional leader."
Shadow Secretary for Children, Schools and Families, Michael Gove, said: "
"I'm deeply upset about Steve's death. . I'll miss our conversations, his advice, and the contribution he made to helping improve our schools."
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