Which country in Europe had masks but no other Covid measures? Which had 2m distance in supermarkets but nothing else?
You suggested a suite of measures, rather than any one in isolation. Thus this is not the appropriate evidential approach.
No country or even region anywhere had only one measure so we can see the impact of that measure alone. We have to go with broader evidence of what probably works or we’d do nothing.
Again though, where's this 'probably' coming from? If you just want to take a punt as you're more comfortable with the idea of doing something than nothing and you think the downsides are worth the chance of improvement, say that. It's understandable.
Are you saying not to have any measures in place at all
I actually think in an English context at least, measures become increasingly moot with time because the population aren't having it. This is liable to get worse not better as the Partygate situation progresses. It simply wouldn't be possible to implement new restrictions now, for example, even if the evidence that they'd actually bring down cases existed. And governments having laws they can't enforce is damaging in the long term, so because of this plus the lack of proof it's achieving anything I've no objection to Plan B going now.
What we need to look at is appropriate support. I'd like to be able to beef up sick pay and employment rights so people who are ill can take time off, provide free high quality masks to all ECV people who want them and better target the vaccination programme so people who want the jabs but face barriers we could tackle with resources (travel difficulties, phobias, access to appointments etc) can get them. The requirement to isolate continuing to exist with no corresponding right to support is disgusting and certainly leads to covid positive people disguising their status to employers.