Robert Rankin is undoubtably very funny, but I find that he's almost always unable to construct an ending to his books. With the exception of The Antipope (which asides from being hilarious, got me attacked by a group of zealous Catholics in Germany), and arguably Armageddon: The Musical, his books tend to feature "Christ, better stop here before it spirals out of control" endings, in which he breaks the fourth wall to joke about all the plot holes left unfilled. This was fair enough the first time he used it, but using it for the latter two parts of The Armageddon Trilogy was just plain cheap.

But you really should read the Brentford Octology and The Armageddon Trilogy. I'm skeptical about his other works. You can't beat Elvis travelling through time with a quantum sprout called Barry.

"Bang!" said the explosion.