Cases will rise until Christmas, then at least double from that high level after Christmas due to the ridiculousness of the 5 day 'mixing' period.
Then schools will re-start, and students will go back to university, boosting things still further.
If this is just in the north, there will be punitive regional restrictions there.
If it is bad anywhere in the South, there will be a national lockdown.
It won't achieve much, because schools will still be open. However, it will reduce things a little, so there will be a much heralded 'return to freedom', probably around half term (which would have been the ideal time for a lockdown, aided by schools being closed) .
Then repeat, aty least until Easter.
As supplies of effective vaccines will be extremely limited, due to no deal Brexit affecting all imports, we will be reliant on the less effective Oxford vaccine. There will be no effective uimmunity for vulnerable groups until at least Easter.
Vaccination - like actual Covid infection - is unlikely to create lasting immunity, and there will not be sufficient supplies or planning to start immunising again for next winter in time.
So there will be a brief respite in the summer, and another wave next winter.