People seem to have taken from Johnson's statement that the lockdown will be for 6 weeks.
This is not what he said, and almost certainly not true.
What he said was that if 2 million per week can be vaccinated, then the four most vulnerable groups will have had the jab in 6 weeks.
1. 2 million per week is an absolute best case scenario. Unlikely, not impossible.
2. It takes 2-3 weeks for immunity. So that takes you to 8 weeks absolute minimum.
3. Hospitals will still be full of the already sick and dying. That will take a few weeks to clear.
So 8 weeks is the absolute best possible case. 12 weeks is probably realistic; 6 weeks is not possible. I'd love to believe 6 weeks, but it's hard to imagine I'm afraid.