user: Question: When were episodes first broadcast with Jessica Ennis as andrew and jacks guest?
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']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['05x01', '20 April 2012', 'Georgie Thompson', 'Steven Gerrard , John Bishop', '8–8']
SQL:

assistant: SELECT "First broadcast" FROM "Table" WHERE "Andrew and Jacks guest" = 'Jessica Ennis';