user: Question: What was the first broadcast date of the episode in which Sean's team is made up of Peter Serafinowicz and Johnny Vegas?
Columns: ['Episode', 'First broadcast', 'Seans team', 'Daves team', 'Scores']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['3x01', '26 May 2006', 'David Baddiel and Ruth Badger', 'Alan Carr and Ulrika Jonsson', '6–9']
SQL:

assistant: SELECT "First broadcast" FROM "Table" WHERE "Seans team" = 'Peter Serafinowicz and Johnny Vegas';