I agree Germany does Christmas exceptionally well, but I want my kids to know both traditions, so we do a bit of a mix and have a British style turkey dinner (although a bit scaled down, just the one course) on 24th before the Christkind magically puts the presents under the tree - on 25th we go to MIL for a German style Christmas meal with a Croatian twist - very international!! I love the presents on the eve of the 24th rather than being woken at 5am on Christmas day :) We also do both Nikalous on 6th and Father Christmas fills stockings, which are opened on 25th in the morning of course...
If you want to do British Christmas food as well as/ instead of German most things you can make of course, but you won't find suet for mince pies anywhere, for love or money - well maybe a local butcher will be able to get you some if you ask well in advance. I made veggie mince meat last year - also good as I am not a huge Christmas addict so not one of the people who start making mince meat and Christmas cake in September... the veggie mince meat only needs making a week or so in advance.
You will easily find smallish frozen turkeys in the supermarket btw, and also tinsel and the like if you want that, and tree lights (personally with 3 small children the real candles on the tree are a step too far, though MIL does that).
Go to Christmas markets for the wooden decorations and the atmosphere, drink lots of glühwein yes :) My favourite thing is going to a Christmas market in a forest clearing, from which you ride out in a tractor trailer into designated areas of forest to pick out and cut your own tree - the kids absolutely love that!