https://www.discogs.com/release/602486-Madness-It-Must-Be-Love
A cover of the song by Labi Siffre from 1971. The ten intervening years have not made the song more cheerful: listening to Labi Siffre makes me more happy than Madness ever did.
The video Madness made for this song features Chris Foreman and saxophonist Lee Thompson playing their instruments under water. Accompanied by an orca. Please don’t try this at home kids! Labi Siffre plays violin in a cameo on that same video.