Comic Fantasy. Not one of his greatest books but still packed with funny moments.

Synopsis from Amazon:

"The sun rises late, dirty and so badly in need of a service it's a wonder it gets up at all. The moon's going to be scrapped soon and a new one commissioned - but they've been saying that for years ...All is not well with the universe, and it's because the mortals are running the show. It's time for a Higher Power to take charge"