He has put his name to a number of magic set for retail sale and has worked closely with producer Paul Andrews in creating magic for his television and live shows. Mulhern does not work with a regular assistant for his illusion performances, preferring to work with a range of guest celebrity assistants. Most notable of these is his former "Saturday Showdown" co-host Holly Willoughby, who has assisted him on many occasions in a variety of illusions including being sawed in half. Other celebrity assistants have included the singers Katherine Jenkins, Rachel Stevens and Louise Redknapp, and the actress Mischa Barton.