I'm thinking the new strain must be very serious and governments are withholding the information for now until after Christmas so we can have somewhat of an OKish Christmas day. I feel they will drop a bombshell after Christmas and maybe even introduce a harder and harsher lockdown like in wuhan.
It must be serious for the government to implement a quick lockdown, and cancel travel and ban Christmas. It must be serious for the eu countries to start closing of the UK where the new strain is higher. A lot of the eu never closed off from each other earlier in the pandemic when it was kicking off. Some places did close off and some had travel restrictions and as soon as possible there was travel red, orange, green light map within the eu and Europe.
It must be serious.
If its very serious why don't they tell us now and screw Christmas. There will be people breaking guidelines all around but it might shake people up and make them sit up straight and behave and follow the guidelines on travel and contacts.