I would actually support a move to Tier 3 but keeping schools closed, before I would support opening the schools and keeping everything else shut again.
The damage is done re education for this year, and I say that as someone with a primary school DD, who (if we are out to Easter) will have had just 7.5 weeks in school in 12 months. Sending them back for a couple of weeks pre Easter to then be off again is more unsettling for the kids in terms of routine than leaving be, particularly if we're still playing bubble hokey-cokey. It causes a heck of a lot of mixing, as well, because there is no pretending schools can distance with current measures.
Tier 3 but no schools keeps mixing down but allows businesses to open, families to see one another a bit, kids exercise and activities to go ahead, gyms to open, and the risk of transmission is lowered without schools, so this could possibly be opened more. I'm in G Manchester - Tier 3 has been our norm for a year. It's liveable with, with the exception that my DD hasn't actually been able to 'play' in person with a friend for a year now.
It's counter to the understood rhetoric re schools, I know, but I would stay put until scientists say numbers low enough, then move to Tier 3. If we could aim for that by say mid March (conceivable on current trend), and stay there until after Easter to see what affect, that would give families chance to have a break, see each other, etc without the increased risk of transmission. By then, the weather should have improved, so outdoor mixing much, much easier to achieve.
Schools could then return in a staggered format after Easter, with regular testing for all, and a good number of vaccinations done. Masks mandatory in secondary and upper Primary. Review again and back in full time for the summer half term to allow grading and transitions.
Then release again for the summer and vaccinate like crazy.
I understand why schools are important, but, honestly, the In/out, bubbles popping, no distancing set up we had in Autumn was just stupid. DD had to isolate twice, including her half term. It's just not helpful and its not less stressful than planned home-schooling. Too, schools going back does mean other restrictions have to be tighter, so their return guarantees a tightened Tier 4 for longer. Our kids surely deserve a chance to actually see their families, see their friends, get their hobbies back, have an actual holiday break, as well as being stuffed full of English and Maths? We need to give the poor little sods chance to have a childhood, too, and that's more than school.