Completely agree re lack of innovative thinking. However, I think a lot of it is that this kind of thinking has costs associated which the government isn't willing to meet. So pubs, ikea etc are all implementing solutions but they're meeting the costs themselves (there may well be some incentives etc, but overall, they see it as an investment otherwise they'll go bust).
But things that require government funding and intervention from transport to schooling, has not received it. I'm still struggling to understand how when they told people to go back to work they weren't willing to fund increased public transport so everyone had to go back while public transport was still operating at, at best, 75% (London).
It's the same with schools. Portacabins, alternative venues, increased staff are all valid ideas and which could be adapted according to individual school/local authority as is practical.
Also, government didn't THINK about the simplest things. So eg the 15 child bubble. But because they're all from private schools, it probably didn't occur to them that a lot of schools can't do 15 child bubbles because classrooms simply aren't big enough. So, in our school for example, we would have to have 3 bubbles per class (so that's three classrooms, three teachers etc) because the maximum number of children we can fit into our classrooms, with social distancing etc, is 12. For some classrooms it's more like 9 or 10. The sheer logistics of increasing the number of classrooms by 3x is insane! And needed more creative thinking. AND FUNDING