Christmas Eve is lunch with in-laws.
Caga Tio (aka the Shitting Log) who gives DS a few presents including a Christmas dvd or a Christmas book. Some sweets and something small like a torch.
Dinner is whatever.
DH and i tidy up and set up stuff for the following day. We then turn off all the lights except the tree lights and have sex 
We don't leave mince pies/brandy/water etc for FC.
Christmas Day is:
DS opens his stocking on our bed.
Downstairs for breakfast (it is different every year, this year pancakes shaped like gingerbread men as DS is getting a small gingerbread man frying pan in his stocking!).
Showers and dressed and walk the dog.
Open tree presents.
Have a light lunch, soup and bread like Oliver Twist
Dinner served at about 5/6 just us 3. It is the main meal, changes every year, not very traditionally British, although I do try and get a couple of Christmas puddings from the British Christmas market - and some custard if they have't sold out!
One of us washes up, the other walks the dog again.
Boxing day: big long dog walk on the beach, lots of playing with toys. I'll text/whatsapp pics of DS playing with presents he was given to those who gave them (actually might take a few days.
We get a new tree decoration every year, usually something i sneak off and buy on our holidays (could be Easter, could be next weekend!). I always wrap it for DH's stocking.
We don't do EOTS, Norad, Christmas jumpers, Christmas Eve boxes, special duvet sets or pyjamas. We have had the same fake tree since 2006. I have handmade the majority of the decorations, including 25 stockings advent calendar that is wound down the bannister - each is big enough for two large chocolate bars, but we fill it with bonbins, notes, Playmobil character or Lego blindbag on DS' birthday.
We do a lot of crafts, DS is busy doing stuff at school (6yo) plus we see the town's tree lights go on. We visit one FC in a big department store, great guy very patient, 2 excellent quality photos free. We always get one with DS and one with DS and his same-age cousin. They are lovely to get out and see every year.
Oh, and DS' stocking has space for 18 photos. Every year we take a photo on Christmas Day and before I put the decs away in January, i print the photo and stick it on the stocking. This is DS' 6th Christmas - he is already laughing at his younger pictures! When he has moved out and set up home somewhere he can have his stocking and friends/girlfiends/boyfriends/grandchildren can laugh with him.