Gently heat the vegetable oil in a small pan, add the curry powder and turmeric and cook over a very low heat for 1 minute, stirring constantly. Remove from the heat and cool slightly.
Put the diced chicken into a bowl, add the spice mixture and rub it into the chicken. Add the mayonnaise, mango chutney and raisins and mix well. Fold in the chopped coriander and season to taste.
Lightly butter the bread and spread the Coronation chicken mixture over half the slices. Sandwich together with the remaining bread, cut the crusts off, then cut each sandwich into fingers.
