This is a good thread, because I've been thinking a lot about this.
First and foremost:
Not made it a policy to frighten the public out of their wits. I think this was a very, very bad move indeed, along with infantilising the public with those stupid three-word slogans.
Not pledged to "beat the virus", or to "do whatever it takes". Boris said this to pacify the panicking public, and this made it politically impossible to ease restrictions. I think they should have said "we cannot eliminate the virus; we can only lessen the harms". It is a curse of the modern age that the public expects the government to be able to solve everything. I think that a few decades ago, it was more acceptable for governments to tell the blunt truth, and say "there is only so much we can do in the face of nature; and we risk causing much greater damage if we try to stop the inevitable".
Admitted from the very start that lockdowns would cause great damage, if they went on for too long, and sold them as an extremely regrettable measure, rather than the only thing to do. Because they were sold as the solution to "save lives", "protect the NHS" and "in twelve weeks, send the virus packing", people craved lockdown. Even now, they are still trying to pretend that lockdowns were harmless.
Assured us that lockdowns and other restrictions were temporary. With their use of phrases such as "new normal", and the drip-drop boiling frog method of "just three more weeks, just three more weeks, normalish by Christmas, significant normality by Easter, just until the over 70s are vaccinated, just until the over 60s are vaccinated, just until the over 50s are vaccinated, etc.", it looked very much as if restrictions would become very, very permanent. Even now, there's still the possibility that they might be brought back at the drop of a hat.
If lockdown became inevitable, instead of throwing death figures at us all the time (which showed that lockdown was FAILING its objective), telling us more about the damage lockdown was causing.
If one good thing has come out of what happened, far more of the public will be aware of how easily the government can use the media to distort reality, and to manipulate the public. Hopefully lots of the public will be much less trusting of government from now on, and less likely to believe everything they say.