Preheat the oven to 350°F.
Place the chicken breasts on a sheet pan and rub the skin with olive oil. Sprinkle liberally with salt and pepper. Roast for 35 to 40 minutes, until the chicken is just cooked. Set aside until cool enough to handle. Remove the meat from the bones, discard the skin, and dice the chicken into large bite-size pieces.
For the dressing, combine the mayonnaise, wine, chutney, curry powder, and 1 1/2 teaspoons salt in the bowl of a food processor fitted with the steel blade. Process until smooth.
Combine the chicken with enough dressing to moisten well. Add the celery, spring onions, and raisins, and mix well. Refrigerate for a few hours to allow the flavours to blend. Add the cashews and serve at room temperature.