My friend Margaret Henry, who has died aged 80, was a film-maker and teacher with a passionate belief in fighting for a world free of racism and injustice.
She taught documentary and screenwriting at the London College of Printing from 1994 to 2002, and was then head of screenwriting at the London Film Academy until 2008. She had a significant influence on a generation of film-makers, particularly for her work as a researcher on Blacks Britannica, a landmark film by David Koff (to whom she was previously married) about racism in 1970s Britain.
