Hey engteach, you sound as sad as me. I have a selection of xmas films which I watch every year, including: Scrooged, National Lampoons xmas vacation, The Grinch, The santa Clause, Home alone, Jingle all the way and one of all time favourites ELF. And as for christmas tv episodes, I've watched The Vicar of Dibley the Christmas lunch incident about 600 times. I also like 'The greatest store in the world' and 'Flint Street Nativity'.
Strangely enough, another favourite to watch at xmas even though it isn't an xmasy film is 'Arsnic and old lace'. It's well before my time but I got it for my mum one xmas and it's become the tradition to watch it.