Like Alanmakaree I try to have some family dinners, and single portions of the same to supplement (in case of either just one person home some nights in the madness of the run up - or to extend the family portion with unexpected visitors) in the freezer - lasagna, spag bol, curries, chilli - boeuf bourguinon sounds like a good addition!
I also try to have a good clear out of cupboards in late summer, and restock with fresh for autumn/winter. There are often offers on storecupboard products, or good BOGOFs, or vouchers for money off if you spend over a threshold, over the autumn - and I use those to restock my general stores, baking goods, etc. And I also try to avoid the supermarket in December if I can - between internet shopping and having stocked up in advance, I may only need a couple of small bits and the basket till rather than trolley loads and fighting my way through the hordes.
Useful things I find are:
Pasta shapes and jars of good tomato sauce (we like Sacla tomato and roasted veg, or Sacla tomato and chilli)
Pesto Rosso
Tins of tomatoes, tomato puree, and passatta
Rice (easi cook, basmati, Arborio for risotto, and pudding)
Jars of good curry sauce (a couple of Pataks mostly) and curry paste to marinade meat
Part baked bread - mostly the packs of 4 rolls (not demi baguettes, half the size again), but some crusty batch round rolls and some ciabatta as well
Sauces and seasonings
Tinned tuna and tinned sweetcorn (can make a store-cupboard dinner with those, an onion, some cooked rice and curry powder)
Tea bags, ground coffee, hot chocolate powder (mini marshmallows)
Flour, sugar, butter, raisins, cherries, mixed peel, baking powder, baking spices, jar of vanilla etc
Packets of biscuits we like (rather than tins) - good for visitors
Crackers - I get a couple of different packets we like for the Christmas season, and we generally use portion packs the rest of the year (to avoid waste) so I'll add a few of those if they are on offer
Tin foil, cling film, baking parchment, bin liners, food storage bags (ziplocs) for both freezing and just marinating things
Cleaning stuff
Paper products - toilet rolls, kitchen towels etc
Non alcoholic drinks - squash, some fizzy things, mixers
Extra wine for entertaining, some extra beer, but I only get spirits if there is something that we use that is running low (like gin)
In terms of things for Christmas itself, rather than winter:
Crackers for cheese
Biscuits (a selection of nice packets rather than tins)
Big sharing bags of crisps and some roasted peanuts
Mince pies (M&S) and stollen (Lidl)
Loads of veg
Sausage meat (for both stuffing, and to make sausage rolls with readymade puff pastry)
I tend to stock the freezer with breadcrumbs make from heels and ends of bread over the autumn - and if I have plenty, I will make up a basic stuffing as well to freeze which I can use for small joints for to stuff tomatoes and mushrooms as a nice dinner etc. Or to have Christmas stuffing already made just to add a few bits to.
I also often make up a large bag of crumble mix for the freezer - then I can make a fast dessert by just throwing some fruit in a dish and crumble over the top and chuck it in the oven.