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Pamela King and Angela Barrs (THES, October 14) represent me as a stone-throwing, glass-house dweller because I confused an idiomatic error with a grammatical one in my article (THES, September 30). I did not; whoever edited my article did. The example I gave of a grammatical error from my students' written work was "There is no criteria".

ROBERT JEFFCOATE

Chalfont Road

Liverpool