Vibert grew up in Cornwall and attended the Wesleyan Methodist Truro School along with a number of key members of Aphex Twin's Rephlex Records crew. Luke and another school friend, Jeremy Simmonds, released an album on Rephlex under the name of "Vibert/Simmonds" which attracted attention from the Rising High music label. As a result of the popularity of the style in the early 1990s, Rising High commissioned an ambient music album from Vibert, who delivered "Phat Lab Nightmare" under the alias Wagon Christ in 1993.