The 25th CD set, as well as the first of a new series of "Goon Show Compendiums" (which contains the first 13 episodes of series 5), were released on 7 April 2008. The Compendiums' bonus material includes notes by Ted Kendall, audio researcher and restorer, on the sources used for the recordings, which include BBC Sound Archive and Transcription Services master tapes and discs, unofficial copies made by engineers or other BBC staff, and even domestic off-air recordings from which a few cut lines were restored.