user: Question: How many series are there total?
Columns: ['No. overall', 'No. in series', 'Family/families', 'Location(s)', 'Original air date']
Types: ['text', 'real', 'text', 'text', 'text']
Sample row: ['UK4', 1.0, 'The Collins Family', 'Northampton', '5April2005']
SQL:

assistant: SELECT COUNT("No. in series") FROM "Table";