SCHEMA:
CREATE TABLE table_28859177_3 (original_air_date VARCHAR, directed_by VARCHAR, written_by VARCHAR)
USER:
What is the original air date for episode graeme clifford directed and lindsay sturman wrote?

QUERY:
SELECT original_air_date FROM table_28859177_3 WHERE directed_by = "Graeme Clifford" AND written_by = "Lindsay Sturman"