user: ### NOW ANSWER:
Question: Which Written by has a Code of 1.2 1.3?
Columns: ['Block', 'Title', 'Directed by', 'Written by', 'Code']
Types: ['real', 'text', 'text', 'text', 'text']
Sample row: [1.0, '"Rose" "Aliens of London" "World War Three"', 'Keith Boak', 'Russell T Davies', '1.1 1.4 1.5']
SQL:

assistant: SELECT "Written by" FROM "Table" WHERE "Code" = '1.2 1.3';