I can see this issue through my library's online reader, so it's legitimately out. It's 182 pgs and comes with a Watches & Jewellery supplement.
As the unfestive cover might suggest, there's no real mention of Christmas in this December issue, just a vague mention of 'the party season' but no real articles targeted towards it, there are no gift guides or full-on glamorous dressing. Either that's yet to come in the January issue - or magazines have started doing that thing where they ignore Christmas, because their content exists to get reprinted as-and-when needed (I have seen Tatler fashion editorials reprinted in Euro Vanity Fairs).
It would not surprise me if the next issue of UK Vogue comes out, and the issue will be a game of two halves - the articles at the front of the magazine will be all about Christmas, but the fashion editorials themselves won't reflect the holidays, they'll be winter-spring seasonal dressing so that the content can continue to be re-used in Dec-Jan editions in Europe.