Driving across the New Forest listening to Andy Williams Christmas Album - it has to be this album because I remeber the songs from when I was a kid - to buy our Christmas tree and coming home and having buttered crumpets and mulled wine. We do it every year and it never fails to make me feel Christmassy.
Also getting the Christmas Edition of the Radio Times (my Mum always buys it for me instead of a Christmas Card has done ever since I left home) and circling all the programmes I want to see, I used to do this with my sister when we where kids and now I dio it with my son.