It isn't a running gag or anything, it's just 'one of those things'. For the last four episodes of The Howard Saga, I do the voice of Death in Darth Vapour style. But Lawrence played it in Howard's From Space, and Stuart played it in Christmas Carol, simply because we were trying to find a suitable voice for the character.
In regards to the rather strange references to christmas in it, just in case anyone was wondering...
Howard's From Space was originally written to be a christmas special for 2000, I believe), but was never recorded at a suitable time. As a result, the christmas jokes were kinda warped
