@AnniversaryScaresMe
In terms of whether measures are proportionate - ultimately to stop the spread of covid we should all have isolated from each other at the start. Every individual alone. But there are reasons why this wasn't expected or enforced. Perhaps you view this as purely a practical consideration - how would housing work if we were all to be separated? - but I thought there were some humane concerns eg. DC going between separated patents' households, care visits, and so on. What concerns me is the humane side of stuff that was or is being missed. I don't think anyone should have been made to be alone in the first lockdown, for example. No matter what it meant for virus spread.
What specifically of the current restrictions do you think are disproportionate?
No I don't think lockdown 1 should have consisted of every individual isolated (however it should've happened far sooner), and I agree there were things missed that have now been rectified in our current situation. I think the lack of bubbles for single people at the beginning was justified (i.e, the least at risk people were isolated to help prevent transmission - if physically or mentally unwell the restrictions did not apply) and now that we know they contribute very little to spread, they're here to stay. And I say all this as a single adult who's mental health has definitely taken a hit the last year, I'm not typing from a lovely 5 bed house with my gorgeous family 
In terms of opportunistic power and so on, they thought the public wouldn't adhere to lockdown as well as we did. They've learnt something about us, and wielding power over us, for future opportunities.
In comparison to other countries, the UK has a shocking level of compliance (largely driven by government failures leading to a complete breakdown of trust). See how in NZ they've take a proactive approach of demonstrating the benefits of lockdown etc, and people are happy to make the decision to comply. I really don't think the government are rubbing their hands and thinking how well they've manipulated us and what else we can be made to do.
It's also convenient that protest is illegal.
But is isn't illegal to protest? You can organise online community groups, tweet about it, contact your MP, put banners up outside your house, go for a run wearing a sign or whatever. See how Greta Thunberg has very successfully moved all her climate change protests online since last year. I find that kind of statement a bit alarmist, along with that our "freedom of religion" has been removed. It's illegal to gather in large groups to minimise transmission, but that doesn't stop you finding alternatives. If at any point freedom to protest was actually illegal, then yes, I would be extremely concerned!