If you can't find a place to be with others on the holiday, I'd suggest you roast a duck or chicken, a few potatoes, and it's my understanding brussel sprouts are a seasonal treat over there? If you like them, I would add that as well or another veggie you enjoy. For dessert, pick your very favorite and have that! THEN, I would find one friend who, if they cannot join you in person, can join you by phone and share in some "table talk" as you eat.
I would also suggest if you wish to have dinner with someone, call a local nursing home/facility, and see if there is anyone there without family that you might be able to share a meal with. The elderly are sometimes very alone on holidays and the best gift you could give is yourself. Those who are alone on the holidays can seek out others who are alone and suddenly you have an instant family.