Combine half the flour, salt and pepper; mix well. Sprinkle chicken with flour mixture. Reserve excess flour mixture.
Brown chicken, onions and celery in oil in a large skillet. Pour off fat. Add 1/4 cup water, and using a wire whisk, get all the stuff off the bottom. Stir in curry powder and bring to a boil. Throw this whole mixture into a crockpot and cook on low for 6 to 8 hours, depending on the age and temperature of your crockpot’s low (so many variables with these things!).
When chicken is through cooking, combine reserved flour with remaining 1/4 cup water, mixing well. Transfer chicken mixture into a saucepan and bring to a boil. Stir the flour and water into the chicken mixture; add the prunes and olives and continue cooking for 3 minutes or until properly thickened, stirring occasionally. Add the cauliflower into chicken mixture and heat through.