Uploaded by Pauline Butcher Bird herself, who says:

The Interview was made for a local radio station but it was never broadcast because it was too contentious for 1988 England (parts 3 and 4). Frank was on his final tour Broadway the Hardway though we didn't know that at the time. You can read more about why the tour collapsed in Andrew Greenaway's book, Zappa the Hard Way. Pauline had worked for Frank in California from 1968 to 1972 and has written about her experiences in her book featured above.