user: Question: If the UK air date is February 18, 2013, who was the episode written by?
Columns: ['Total', '#', 'Title', 'Directed by', 'Written by', 'Canadian air date', 'UK air date', 'Canadian Viewers (millions)']
Types: ['real', 'real', 'text', 'text', 'text', 'text', 'text', 'text']
Sample row: [66.0, 1.0, '"Murdoch Air"', 'Don McCutcheon', 'Peter Mitchell', 'January7,2013', 'February 4, 2013', '1.184']
SQL:

assistant: SELECT "Written by" FROM "Table" WHERE "UK air date" = 'February 18, 2013';