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May I correct one or two details in your account of my impending leave in Cambridge (Diary, THES, May 19).

I will not be taking a sabbatical, enjoyable as that might be, but adding some unused leave to this year's summer vacation. I will be back in harness on September 1.

My research will be in economics, studying the relationship between investment in higher education and the rate of development of advanced economies. I am certainly no historian, much as I appreciate your diarist's wish to designate me as one.

David Triesman General secretary Association of University Teachers