Probably less overall.
Socialising will definitely be less - we don't go mad but there are usually Section lunch, Division Pizza Night, Office party and a few Friends at work Lunches/Dinners for me, and similar for DH - none of those will happen this year.
Decorations etc - I work in the city centre, and usually am tempted by the shops on my lunchbreak. So that is reduced this year (I have more than enough....).
Presents - I still need to have presents for the same number, but I have been crafting to keep myself busy during lockdown etc, and mostly using up my stash of materials rather than buying new materials, so that will save me some money. But I haven't been out to the summer sales (when I tended to get a good few things) or general shops so whatever I do buy will likely be higher than normal prices. And we don't know what to get DD yet (teen, with very limited wants but those tend to be expensive). And I don't know for DH either - last year I had a Christmas Eve frantic purchase which was ££ but he loved, but I prefer to be better organised. So it may be around the same or slightly less.
Food - definitely more. Just because we will all be home more, and want to cook more than usual, and can't go out like most years. So as well as the actual turkey dinner and usual meals, we will probably do more elaborate dinners and more nice snacks than usual over the holiday period. And I may go more for convenience items, and special treats, than usual. Possibly more on alcohol also, to have something nice to look forward to (quality not quantity), and that we might be sitting reading books which will allow a quiet afternoon glass more than normal etc.
I don't tend to get fancy outfits every year - DD doesn't "do" naice clothes, so clean jeans and a nice top is really good (last year, I think she was in sports leggings with a nice top....). I have plenty I can re-wear, as has DH. But a new pair of PJs for winter is an essential for everyone each Christmas, and this year probably even more so. So the same.
And I will spend more on entertainment - at least 1 new board game, possibly a jigsaw, and definitely on books and magazines/annuals for us all.
Oh, and heating and electricity bills will be up too, as we are home more and doing more decorating, having tree lights on longer etc.
But travel costs will likely be down, as I am very uncertain about the potential for us to travel to see our families over the holiday period. Definitely no rental of a cottage cost (if we go "down home" for Christmas itself, it's the 1 time of year we stay independent - just to cope with both families and their demands for our time and the chaos in both houses!). But I think even the annual New Year's family gathering is in severe doubt. (The corollary of that, is that I'm likely to spend a lot more on postage/courier to get gifts to family as we won't see them).
Overall, I think that adds up to probably spending a fair bit less overall, but some categories will be more than usual and they are probably the ones that are more hidden in my normal budgeting (absorbed into everyday expenses - not part of "Christmas" budget).
