Retail: A tighter definition of "essential retail" (as in what can be sold, not just whether a shop happens to sell some of it, so can stay open for everything else too) - food, hygiene, cleaning, medicines, petfoods for example. A second category available by pre-order / collection for DIY, kids clothes, car/bike parts, etc to cater for all the "but in exceptionaI circumstances someone might need" crowd (be honest - most of these exceptions could wait a few hours, nobody suddenly discovers in January that every single item of last year's winter clothing no longer fits and they'd be going naked if they couldn't buy new clothes right now). Anything else by delivery only. Then all the stores which sell some "essential" items will only be selling those and won't be such a draw - a trip out to B&M to browse the ambient food and cleaning aisles isn't such an attractive proposition as candles and cushions.
And while they are at it make newspaper articles like this: www.thesun.co.uk/fabulous/13634578/bm-egg-chairs-back-stock-175/ (lots of regional press doing similar) which encourage and normalise in store shopping for non essentials during a lockdown actionable against the publishers.
Curfews: probably self defeating if it forces more people to shop at busier times. Point out the quiet times so people who haven't considered changing their shopping hours actually use them to spread the load.
Schools: Yes it's shit, and they're not getting the education we want them to have, but they should only be in school if they are vulnerable or there isn't actually anyone at home - maybe not even then at KS4+ level at which age they should be capable of safely working independently. Plenty of us are juggling home working with kids at home too, even if we are nominally keyworkers but are able to do our jobs remotely.
Masks - probably more effective if people were better informed about the effectiveness of various types - and how to wear them properly. Haven't been in any retail outlet except food shops since March, and I'm still seeing quite a lot under the nose, gaping at the sides, or clearly bought more for style than function masks (does anyone actually believe that net/lace/mesh masks are going to have any effect?). Also enforce the use of trolley/ basket wipes, not just insist that people wear masks - quite often see the sprays run out, and even more often people not bothering to use them.
Takeaway coffees etc - make them only saleable in refillable cups belonging to the customer, or in refillable cups sold to them. Once everyone has forked out a few times for insulated travel mugs they will soon switch to bringing their own along if they want to walk with a drink (neatly avoids the bins overflowing with discarded cups problem too). The actual act of walking with a coffee really shouldn't be an issue, as not everyone can exercise at a pace which precludes it, and it adds nothing to the risk, but congregating / queuing at takeaways could do.