Which Winner has a Last 16 of £400?
CREATE TABLE "prize_money" (
  "year" text,
  "winner" text,
  "runner_up" text,
  "semi_finalists" text,
  "quarter_finalists" text,
  "last_16" text,
  "last_32" text,
  "last_64" text,
  "total" text
);
SELECT "winner" FROM "prize_money" WHERE "last_16"='£400';