user: Question: What is the UK broadcast date of the episode where Chris Bonington was the presenter?
Columns: ['Episode No.', 'Episode Title', 'UK Broadcast Date', 'Presenter', 'Countries Visited']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['#3.1', '"Crewe to Crewe"', '1996-09-04', 'Victoria Wood', 'United Kingdom']
SQL:

assistant: SELECT "UK Broadcast Date" FROM "Table" WHERE "Presenter" = 'Chris Bonington';