What is the highest Poles, when Series is Ginetta Championship, and when Season is before 2007?
CREATE TABLE "career_summary" (
  "season" real,
  "series" text,
  "races" real,
  "wins" real,
  "poles" real,
  "f_laps" real,
  "podiums" real,
  "points" text,
  "position" text
);
SELECT MAX("poles") FROM "career_summary" WHERE "series"='ginetta championship' AND "season"<2007;