After the Vibrators broke up, Knox worked as a solo artist, recording an album "Plutonium Express", which came out on the Razor record label in 1983. He also played guitar on Robyn Hitchcock's solo debut album, "Black Snake Diamond Role". He did two gigs with Alex Chilton, one of which was recorded and released as the album, "Live in London". Also in 1983, Knox played guitar and wrote material for the Urban Dogs, a band with Charlie Harper from the U.K. Subs and produced an album of the same name. He also played guitar on the U.K. Subs' 1988 album, "Japan Today".