Which title, directed by David Kendall, had 3.7 million viewers?
CREATE TABLE "table1_18054886_1" (
  "no_in_series" real,
  "title" text,
  "directed_by" text,
  "written_by" text,
  "original_air_date" text,
  "prod_code" real,
  "viewers_millions" text
);
SELECT "title" FROM "table1_18054886_1" WHERE "viewers_millions"='3.7' AND "directed_by"='David Kendall';