user: Question: What is the airdate when the story is listed as Hugh Leonard?
Columns: ['Episode', 'Title', 'Story', 'Adapted by', 'Director', 'Airdate', 'Exists?']
Types: ['real', 'text', 'text', 'text', 'text', 'text', 'text']
Sample row: [201.0, '“ The Machine Stops ”', 'E. M. Forster', 'Kenneth Cavender & Clive Donner', 'Phillip Saville', '6 October 1966', 'Yes']
SQL:

assistant: SELECT "Airdate" FROM "Table" WHERE "Story" = 'Hugh Leonard';