Table: football_quiz
Columns: episode
first_broadcast
andrew_and_jacks_guest
jamies_guests_peter_crouch_replaced_jamie_redknapp_as_team_captain_for_one_week_in_series_5_episode_2
scores

Question: When were episodes first broadcast with jessica ennis as andrew and jacks guest?
SQL: SELECT "first_broadcast" FROM football_quiz WHERE "andrew_and_jacks_guest" = 'Jessica Ennis'