With seven days remaining until Christmas, the official Doctor Who website was today updated with the eighteenth door on it's annual exclusive online Advent calendar. Inside today's door is an audio extract from 'Who on Who?', an upcoming radio interview with both Russell T Davies, the current lead writer for Doctor Who who will depart from the series next year, and David Tennant, best known for portraying The Tenth Doctor in the show. The preview of the interview can be listened to by clicking here inside today's door on the official Doctor Who website's Advent calendar, and the interview itself will be broadcast on BBC Radio Two on Tuesday the 29th of December at 5.00pm. The nineteenth door on the calendar will be made openable tomorrow, and details regarding it will be posted here, on The Gallifrey Vortex, after the new door is available to open. What are your thoughts on this?