Rex Features
According to The Sun, the pair have conflicting interests, making it difficult for them to find time to write together.
"The boys simply have different priorities now," a source is quoted as saying. "Julian is in love with family life and sees a wild night out as a pint in his local pub. Noel still loves the party scene. He also wants to get out to the US where the Boosh is a big hit on the Adult Swim network."
They added: "Julian isn't as excited and fans are running a sweepstake on the Mighty Boosh forum about him not showing up for their slot at the Comic-Con convention in San Diego on July 24."
The source stressed that the pair remain firm friends, saying: "They still love each other but have taken different paths and I can't see where the Boosh can go now."
