I doubt this will be news to anyone who reads this blog, but the BBC have now officially announced that Zurich, the finale of Cabin Pressure, will be in two parts, and will be broadcast on Radio 4 at 6.30pm on December the 23rd and Christmas Eve. (That link above contains some mild spoilers, such as the names of guest stars, which I won't put here, so as to keep this blog safe for even the most puritanical of spoiler-phobes.)
Also, somebody at this site has noticed that if you start today, and listen to one episode a day, you will reach Yverdon on the 22nd December. And they've also created this rather wonderful advent calendar to go with it:
As the first episode, this is based on the never aired pilot script I wrote to try to sell the show. In the pilot, which was far, far too long and over-complicated, the action of Abu Dhabi took place while they're flying Hester Macauley (the actress from Cremona) to Rome, and the cat was a feral street-cat she falls in love with and decides to smuggle home with her.