Alan Partridge fans have demanded that Steve Coogan and co-star Susannah Fielding should host a one-off special of The One Show as their on screen characters.Coogan and Fielding are currently starring opposite each other in the second series of This Time with Alan Partridge, a weekday magazine show spoof that borrows its guest-focused format from The One Show.Now, an online petition bearing over 2000 signatures is circulating, asking for their comedy aliases to replace regular hosts Alex Jones,