user: Question: What is every episode with Barry Purchese as the writer?
Columns: ['Episode No. Episode No. refers to the episodes number in the overall series, whereas Series No. refers to the episodes number in this particular series.', 'Series No.', 'Episode', 'Director', 'Writer', 'Original airdate']
Types: ['real', 'real', 'text', 'text', 'text', 'text']
Sample row: [41.0, 1.0, '"Chain Reaction"', 'Andrew Morgan', 'Ginnie Hole', '8September1989']
SQL:

assistant: SELECT "Episode" FROM "Table" WHERE "Writer" = 'Barry Purchese';