Too many variables to know!
I would personally advocate keeping cases robustly below 1000 until everyone is vaccinated. We did that last summer (July), and it should be easier this time - more immunity from infection, more immunity from vaccination, more understanding of transmission.
But what the govt strategy is we have no idea. I fear, yet again, they'll open up too soon and we'll get wave 3 sweeping the middle aged.
How much vaccination or previous infection protects against transmission isn't known.
How many people will take up the vaccine isn't known.
I don't think we'll be able to have "normal" pubs until after the summer. I hope we'll have pubs open with social distancing after Easter, and pretty confident by Spring Bank Holiday.