What I think is under discussed is the fact that we allow for all of these social restrictions measurements but yet air travel across all the EU countries is still allowed.
Also, because some EU countries are claiming that crossing their borders is only allowed for essential reasons proven by documentation, the airport in the country of origin will prevent many people from even being able to board the plane in the first place.
We flew from Northern Europe to South Asia a week ago and the flights were filled 60-70%.
The pervasiveness of the UK variant in Europe would have been contained or at least decelerated with travel restrictions.
A living proof of this is both New Zealand and Australia. These countries still allowed for sea and air freight but banned travel. Both countries are roughly back to normal life, while we in Europe are still trying to blame pharmaceutical manufacturing vaccine output, as if that is the sole cause of our problems.