He placed first in the Jazz category of the 2003 International Songwriting Competition with his song "The Heckler".

[1] Castle plays the saxophone as well as the clarinet and has performed as a backing musician for Duke Special, Radiohead, Blur, Matthew Herbert, Gregory Porter, Sting, Stan Tracey, Humphrey Lyttelton, George Michael, Djabe, Paloma Faith, Marlena Shaw and Jamie Cullum.

Through his interest in drumming as a youth, he became acquainted with Marillion drummer Ian Mosley and many years later performed saxophone on the band's track "Deserve", from their 1999 album Marillion.com, as well as recording an album with Mosley, Postmankind, which was released in 2001.

[2] Castle played the woodwind with the band Storm Corrosion, on their self-titled album.

Ben formed the band to pay tribute to Tommy 'Tootle' Truman, a school caretaker and controversial character who played clarinet in a Trad Jazz band in his local pub every Wednesday night for nearly 23 years.