I’m not convinced Christmas Day will be the big spreader a lot think. Most families I know only seemed to see grandparents if anyone from outside their households, and then only for a few hours with precautions. There doesn’t seem to much meeting through the rest of the holiday period.
I’m sure there were instances of bad behaviour, however I wonder if that will be counter balanced by most of us off work, and schools on holiday. Pubs and restaurants in most places shut except takeaway.
Not saying there won’t be Christmas spread, just not sure we will see it as a big rise from where we are with cases from the last few weeks.