It won’t be twelve weeks of lock down, unless something goes badly wrong,
If we stay on the same trajectory as now, they are expecting the peak At Easter time, then it will tail down. So I think he might extend it for a week or two past that to be sure.
Scientists are dead against an extended lock down, they seem to feel it will lead to a resurgence. Imperial is strongly advising the government against it. They want social distancing in place instead and feel it is better,
It doesn’t mean that after the lock down is finished everything goes back to normal. I think all social venues will remain closed for the twelve weeks, but they will want all other companies to reopen, to get folks back to work, and schools to take those kids where the work can’t be done from home. They will also probably do something about the compensation folks are getting, put a stop to it, to ensure they basically aren’t paying for people to sit at home past the hospitality industry.
It will be a slow lift of restrictions from then till the twelve weeks, Ie end of June, with a careful eye on how it impacts the disease spread.
The thing is though, it’s all predictions, no one really knows. Scientists are using every bit of their extensive knowledge to predict it, but even they are saying it is a prediction.