user: Question: What is the date of the election where Sir Christopher William Codrington was elected as First Member and Robert Stayner Holford as the Second Member?
Columns: ['Election', '1st Member', '1st Party', '2nd Member', '2nd Party']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['1832, 21 December', 'Sir Berkeley Guise, Bt', 'Whig', 'Hon. Henry Reynolds-Moreton', 'Whig']
SQL:

assistant: SELECT "Election" FROM "Table" WHERE "1st Member" = 'Sir Christopher William Codrington' AND "2nd Member" = 'Robert Stayner Holford';