Table: doctor_who_audio_releases
Columns: story
title
doctor
narrator
format
release_date
notes

Question: What is the release date of the bonus interview with Peter Purves?
SQL: SELECT "release_date" FROM doctor_who_audio_releases WHERE "notes" = 'Bonus interview with Peter Purves'

Question: Which narrator has the bonus interview with Frazer Hines?
SQL: SELECT "narrator" FROM doctor_who_audio_releases WHERE "notes" = 'Bonus interview with Frazer Hines'

Question: What is the release date for Destiny of the Daleks?
SQL: SELECT "release_date" FROM doctor_who_audio_releases WHERE "title" = 'Destiny of the Daleks'