More and more people I know are eating out on Xmas day, I mean its crazy money but they haven't got to cook, clean up, or worry about everyone in their house.

If there are staff happy to work, I.e. don't celebrate, then it seems like its a small but growing trend.

Depends. Business can be excellent for anyone in a large jewish, muslim, or asian neighborhood. Those people tend to not celebrate christmas so it’s just a day to them. It’s part of the reason why in the US chinese people like jewish people so much because of how much they eat chinese food at christmas.

They did 80 covers! 

Business is pretty good if your the only place open. They usually use a fixed menu and make quite a bit.