CREATE TABLE table_21105 ("Story #" FLOAT, "Title" CLOB, "Doctor" CLOB, "Narrator" CLOB, "Format" CLOB, "release date" CLOB, "Notes" CLOB)

What is the release date of the bonus interview with Peter Purves?
SELECT "release date" FROM table_21105 WHERE "Notes" = 'Bonus interview with Peter Purves'
SELECT "release date" FROM "table_21105" WHERE "Notes" = 'Bonus interview with Peter Purves'