I don't want to give them any credit but the government not having a plan and the government not telling us the plan are not necessarily the same thing. They might be, but not necessarily.
Early indications of the data from South Africa indicated that the variant isn't as big of a problem, especially if you've had the booster so they pushed ahead with that. Once our own data is published, and they will already have predictions of what it is likely to say, then those early forecasts may be way off. If those early indications were that hospitalisations were spiking rapidly then I think we would have had some announcements. As it is, the no plan but get boosted, be vigilant etc has caused a self-imposed lockdown which will have slowed transmission somewhat and they will have seen from the cases that we have had compared to the number of hospitalisations that it is not as severe. They also know people will be more willing to comply with restrictions after Xmas/NY so if the indications of the less severe variant are confirmed by the data then that ends up being the right thing to do. Cancelling Xmas again would not go down well with the public, not just the Tory backbenchers. Someone posted an Owen Jones article yesterday who couldn't be more anti-Tory and that article said that there was only about 25% public support for restrictions compared to 85% last year.
They haven't followed the science though. The science is a model, not a prediction. It doesn't have any probability attached and it assumes the same level of hospitalisations as previous variants. Data from South Africa is showing that it causes fewer hospitalisations. Changing the model with that assumption would drastically change the numbers and shutting down will do more damage than good. This isn't like last year where we were all un-vaccinated. We, or at least the most vulnerable, are protected by 3 doses. Those other nations have followed the worst case model instead of the most probable.