Sort of out of the miffed department, methinks, but the BBC have an article about a confused pensioner asking Kylie for a cup of tea whilst filming the Christmas episode.
The article (slightly more interestingly) gives this plot summary:
In the special, an alien menace dressed in a dinner jacket invades the 1912 launch party of the Titanic.
Its called Voyage of the Damned and I’m really sure that a version of this came out last year in the Christmas and New Year’s Radio Times.