Born in Staffordshire, David Jackson (as he was then known) grew up in Portsmouth in the Paulsgrove area and he attended the City of Portsmouth Boys School. His parents later moved to Gosport when he was a teenager.

He initially learned to play the violin but soon switched to piano and prevailed on his dad to install one in the hall of their Paulsgrove council house. From the age of 16, he played in bars, and won a scholarship to study musical composition at London's Royal Academy of Music. Jackson's first band, in Gosport, was Edward Bear (not to be confused with the 1970s Canadian band fronted by Larry Evoy).