CREATE TABLE table_name_91 (doctor_who_episode VARCHAR, original_airdate__uk_ VARCHAR)

Which Doctor Who episode has an Original airdate (UK) of 14 may 2005?
SELECT doctor_who_episode FROM table_name_91 WHERE original_airdate__uk_ = "14 may 2005"
SELECT "doctor_who_episode" FROM "table_name_91" WHERE "14 may 2005" = "original_airdate__uk_"