Batt began his career in pop music at the age of eighteen as a signed artist with Liberty Records, having answered the same advertisement as Elton John and Bernie Taupin placed by Ray Williams in the New Musical Express. The talented youth quickly became part of Liberty's production team, and in 1969 he took over production duties from Noel Walker, on blues great McKenna Mendelson Mainline's seminal first release, Stink. Walker and Batt were credited on the album only as "Liberty Staff".
