Slightly unsure which thread this belongs in, but if reflected in progress over the next month and a half then we really will be in a really different situation with easing of restrictions and cases.
Not quote sure of a better way to quote a tweet, but further down that thread he talks about where cases will end up if they carry on going down at the same rate. He then models the impact on cases that vaccination could start to have, with an optimistic curve and a slightly more pessimistic curve. On the optimistic side, sub 1000 cases a day by early March, on the pessimistic side mid march(picture below). He does say that it's a scenario not a prediction and does explain his maths(not that I understand it very much)
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red is current rate that cases are decreasing, not considering the impact of vaccine.
Purely on that basis, I think Easter is a fairly good shot for easing. I have read a number of reports(and said it myself) saying that the Government seems to be going down a route of deliberately under promising and being very pessimistic on lockdown easing/vaccine rollout, having learnt lessons from last year(beat the virus in 12 weeks, normal by November, inhumane to cancel Christmas)