user: Question: When id the episode broadcast with Mark Webber as Jamie and John's guest?
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']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['04x01', '7 October 2011', 'Jason Manford', 'Andy Murray', '8–6']
SQL:

assistant: SELECT "First broadcast" FROM "Table" WHERE "Jamie and Johns guest" = 'Mark Webber';