Released by Parlophone on January 7th of 1991 on cassette. Contains "edited versions - taken from the forthcoming album Innuendo", 12 tracks. Two of them widely available (Hitman and Delilah), others are just edits of album versions. There's also Swedish "Innuendo Teaser" cassette with 5 tracks on it.
(EDIT: It's available in the Hub for instance, so be careful with trade offers ;)