I think what is obvious, is that it is a juggling act, literally, trying to calculate the most optimum time to bring in full shutdown.
Too soon, the virus continues to cause problems and people will get fed up and start to go out and about again, causing a second peak.
Too late, then there could be further issues on the spread and the huge impact it will have on the NHS, which seems to be the worry they have at the moment.
Personally, I think they were expecting this peak and the 'modelers and virologists', will be looking very closely at the spread.
We have to trust them, Boris isn't the brightest, he ultimately can't take the decisions, he will be looking to those professors and health professionals, along with what the NHS to cope with.
Keep slagging the government off, is not going to make any difference and that is what they mean when they say 'we are guided by the science', do you honestly think they are not looking at it from all angles?
As @Sunshinegirl82 girl says, I would rather trust those 'experts', than a lot of people on Mumsnet, who may only have the odd GCSE, or A level in Science!