No, I'm glad Marcus wasn't the voiceover. We don't want a Marcus overload, what with Celeb BB in the new year and then again in May, as well as being an announcer on C4. And the BB Panto voiceover sounds like a proper Panto narrator, how it should be. Or summit.
Apparently he refused to do it when they told him he'd have to do it in full panto dame costume, although his only comment has been his official statement: "If yuz think az dressin up azza wummin yuv got anutha thing cummin; az nee puff, leik. Addaway an shite, man!"