There are two categories of stand-in - Stand-in Simon and Stand-in Mark - used whenever one or both are enjoying compulsory family fun time or embarked on the latest Wittertainment Cruise. In the earlier years of Wittertainment, when the Film Review Show was but part of the Daily Mayo and Mark was a mere contributor, it was often the case that one but not the other would be absent; most often Mark was partnered with Phil Williams, while Simon spoke many times with James King. Since the 2010 redevelopment of the show into a two-hour long weekly epic, Simon and Mark now time their absences together.
- Frank Gardner (The Bourne Ultimatum only)
- Clarisse Loughrey