List the director and producer when Nick Hewer and Saira Khan were starring.
CREATE TABLE table_24725951_1 (
    directed_and_produced_by VARCHAR,
    celebrities VARCHAR
)
SELECT directed_and_produced_by FROM table_24725951_1 WHERE celebrities = "Nick Hewer and Saira Khan"
Below are sql tables schemas paired with instruction that describes a task. Using valid SQLite, write a response that appropriately completes the request for the provided tables. ### Instruction: List the director and producer when Nick Hewer and Saira Khan were starring. ### Input: CREATE TABLE table_24725951_1 (
    directed_and_produced_by VARCHAR,
    celebrities VARCHAR
) ### Response: SELECT directed_and_produced_by FROM table_24725951_1 WHERE celebrities = "Nick Hewer and Saira Khan"