I first realised that people from different ethnic groups could have very different attitudes to the same death, the same violent deaths- the same killings, when I went to see the film Gandhi for the third time in the cinema at the age of 14. It is something David Cameron would do well to remember.

I first went to a glitzy showing of the film in Leicester Square, London with my whole family, including my aunt and uncle who had come over from India, where some of the people involved with the film had met them at their home in Delhi while it was being made; then with a school friend to see it at Marble Arch, London and finally with cousins and friends in Calcutta. (The owner of the petrol station in Southern Avenue had over a dozen tickets spare and gave them to our uncle- our great favourite, my father’s youngest brother, and I was part of a big group.)

Watching General Dyer, in the film, order the troops to turn their guns on the crowds of unarmed people, children, women and men in Amritsar, and to start the Jallianwala Bagh massacre was an entirely different experience in Gariahat, Calcutta to that in either Leicester Square or Marble Arch. There was a sharp intake of breathe in the audience, a feeling that the general had ordered that he turn his guns on us, us personally and then complete dismay. Where in London it was one more scene of violence in one more film, in Gariahat, Calcutta it was something taken personally. My own reaction to the scene and its horror was entirely different in Calcutta and London. In Calcutta the scene was one of pure evil, and in London there was no reaction, no sound and it was just a film.