user: Question: Which Date had a Transfer fee of £8.8m?
Columns: ['Date', 'Pos.', 'Player', 'From club', 'Transfer fee']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['13 July 2007', 'FW', 'Rolando Bianchi', 'Reggina', '£8.8m']
SQL:

assistant: SELECT "Date" FROM "Table" WHERE "Transfer fee" = '£8.8m';