Probably the safest things to allow first really. Anything outdoors is much lower risk.
Schools and stuff like this will be first. If they can get them back in March (schools that is) it'll be staggered, but it'll all depend on rates on / around Feb 22nd when the announcement will be made.
My guess is mid-April (after Easter, which is April 4th, so the school holidays will end on the 11th) is probably more likely to see a full return to schools and, by then, the majority of the people given their first dose in the last month will have received their second.
I'd guess if that happens between that March 8th staggered return (if indeed that happens) and full return after Easter, then the Tier system will return somewhere around then.
Would expect everywhere apart from very remote areas to be in Tier 3, with a gradual easing to Tier 2 across the board as vaccinations continue and the summer approaches, and perhaps around May time most areas will be Tier 2.
I'm not holding my breath, and the best approach for me would be a very flexible one where if there is any hint of a rise it's an immediate halt on the process. Just saying that's what I think will be the ballpark plan.