Has anyone heard anything more about this?
I remember some where a bit sceptical about the Wikipedia entry.
Once Upon a Time In Chiswick By Brian Leveson and Paul Minett
24 December 2009 75 minutes
Susan is feeling down after Janey points out that Nick has 'got away' with not attending four Christmases in a row now, so she decides to invite him - much to Alfie's dismay. Meanwhile, Roger's depressed after not getting a Christmas card from Abi, so after taking a leaf out of Susan's book, he invites her to come to his at Christmas - but how much does the convent mean to her? Later, Alfie packs his bags and puts them in the hallway, causing Ben to fall over them whilst drunk and break his arm. Also, Janey decides to forget about boyfriends and look after Kenzo, but Kenzo's not interested. An uncomfortable atmosphere decends upon the Harper's festive celebrations as Nick hasn't turned up but a knock on the door might just put a smile on Susan's face.
http://en.wikipedia.org/wiki/List_of_My_Family_episodes#Christmas_Special_.282009.29
If it is 75 minutes, it will be the longest episode so far, and the same length as the Fools and Horses reunion specials.