The presenter is joined by a selection of celebrity guests for this festive special celebrating all the things that go into a perfect Christmas and setting out to answer an important seasonal question - what is the best bit? Each of Alexander's guests makes the case for their favourite part of the holiday, and at the end of the show, the studio audience will cast their votes on which one they think is most important. A house band is on hand to provide some seasonal live music to accompany the festivities.