It was only released in 1992 on a promo CD included with 'The Queen Collection' which was Hollywood Records' version of a Christmas box set that year.. had their Greatest Hits, Classic Queen and this bonus CD just stuck in a sleeve inside. The full unedited interview plus 'Thank God It's Christmas' with a previously unreleased proper intro.
You can still find it sometimes at Amazon from sellers, or Ebay. Might even find just that disc itself.. they called it 'Queen Talks', not to be confused with a totally different CD single b-side of the same name.
*edited* ;)
I'd try and help you out, but I have it on tape for one, and I'm not 110% sure where to get it myself. Difficult to find, but well worth it, as I believe it is the last interview Queen gave as a whole, or for that matter any interview Freddie had a part in!!