That is a direct result of the politicians we have empowerd as a public and insipid nature that this group of tories in particular can erode good will and peoples rights with barely a care for any accountability from a press that have lurched further right than ever in my lifetime. I'm lucky enough to know quite a few involved in epidemiology, medical research and healthcare england and the people on that side of the fence have very little polical agenda beyond being forced to 'play the game' for the sake of their careers. Those at healthcare england inparticular are saddened and deeply worried by the move from this government to go away from speaking truth to power. You mention SAGE but they have had to contend woth powerful minisers like the new centralist poster boy Sunak (a hardcore brexiteer) fighting hard against the science and against the lockdowns in some rabid form of short term economics.
Perhaps I am naive for speaking from my limited experience I don't see those involved in the research or practical aspect of the science or medical world being heavily in the face saving politics anymore than they have to to actually do their job in a grubby system that isn't really designed to prioritise them
When sage called for the circuit break in September last year , Sunak brought to Johnson a load skeptic scientists against lockdowns to meet with him.
It was actually the Sunday Times that reported on this which caught my eye. It was him that convinced Boris not to lockdown for the second time at the time Sage suggested.
I think Johnson waits until the last minute when the changes have to be done so he gets no fightback. Waits until everything is critical and we have no other choice to make.