Table: comedy_quiz
Columns: episode
first_broadcast
andrew_and_georgies_guest_lee_mack_replaced_andrew_flintoff_as_team_captain_for_one_week_in_series_4_episode_2
jamie_and_johns_guest
scores

Question: When id the episode broadcast with Mark Webber as Jamie and John's guest?
SQL: SELECT "first_broadcast" FROM comedy_quiz WHERE "jamie_and_johns_guest" = 'Mark Webber'

Question: What date did the episode with Andy Murray as Jamie and John's guest first broadcast?
SQL: SELECT "first_broadcast" FROM comedy_quiz WHERE "jamie_and_johns_guest" = 'Andy Murray'

Question: How many items are listed under 'andrew and georgies guest lee mack replaced andrew flint as team captain for one week' for episode 04x04?
SQL: SELECT COUNT("andrew_and_georgies_guest_lee_mack_replaced_andrew_flintoff_as_team_captain_for_one_week_in_series_4_episode_2") FROM comedy_quiz WHERE "episode" = '04x04'