When was Jonny Leadbeater President?
CREATE TABLE "executive_committee" (
  "season" text,
  "president" text,
  "general_sec" text,
  "treasurer" text,
  "fixtures_sec" text,
  "social_sec_bradford" text,
  "social_sec_leeds" text,
  "media_officer" text
);
SELECT "season" FROM "executive_committee" WHERE "president"='Jonny Leadbeater';