I hadn't twigged it before, but now I have:
The government isn't doing this because they don't want to stop the virus from spreading, or to protect business etc. They are doing it because they cannot actually prevent it from eventually spreading. They could stop one outbreak, but they would not be able, in practice, to lock us all down for 2 months, and then relax it, and then do the same thing again and again every few months every time a new outbreak starts again. Enough people have it in the world that even if every case in the UK is resolved and the infection rate is zero, it will just come back in a few weeks or months. Nothing this government could have done, now or earlier, would have prevented that.
All the government actually has is a few blunt instruments (e.g. ask individuals to self isolate if symptomatic, ask households to self-isolate, close all schools, close all workplaces and bars and restaurants, etc.) that they can use once, maybe twice, at a chosen moment, not indefinitely. Also there are counterintuitive effects: if the children are not in school, then they will have to go somewhere, and they could potentially spread it even more.
However, what's more important is that each of us can each do something to slow the spread.
-We can look at each and every face-to-face social interaction we have planned, and assess whether it's essential or can be cancelled or replaced by something else.
-We can stay home for a modest sniffle, even if it's inconvenient and costs money or results in lost holiday because some employers lack the flexibility or resources to "foregive the absence" or are complete dicks even if they have that flexibility.
-We can cancel our holidays and concerts and nights out, even if we lose money and it's disappointing.
-We can cancel our hair parlour appointments and exercise in the park, or even at home, instead of going to the gym
-We can meet up with friends by video instead of in person.
-If we work in roles of any authority, we can use our full discretion to allow people any and all flexibility that would help them to slow the spread ( relax deadlines, let people work from home wherever possible, allow staggered commuting hours where commuting cannot be avoided, etc.)
Regardless of what the government does, all of these types of actions can save lives by slowing the spread and flattening the curve.
www.flattenthecurve.com/