A great film - Barret + Fielding in the leads wouldn't have worked
I don't want to give any spoilers here but the story needed these new characters.
It just wouldn't have worked with the Boosh guys in the lead roles, the Howard and Vince characters just aren't compatible with the narrative of the film.
I saw it tonight, thought it was great. It had a lovely surrealness to it. Just don't expect Mighty Boosh because the humour is subtly different.
Honestly... I'm not furking your face!!