user: Question: Who was the writer that the director was Alice Troughton and the producer was Phil Collinson?
Columns: ['Block', 'Episode Title', 'Director', 'Writer', 'Producer', 'Code']
Types: ['real', 'text', 'text', 'text', 'text', 'text']
Sample row: [1.0, '" Voyage of the Damned "', 'James Strong', 'Russell T Davies', 'Phil Collinson', '4X']
SQL:

assistant: SELECT "Writer" FROM "Table" WHERE "Producer" = 'Phil Collinson' AND "Director" = 'Alice Troughton';