Johnson has said multiple times that what we are doing is trying to avoid a second spike.
https://www.dailymail.co.uk/video/b...is-Johnson-stay-alert-avoid-second-spike.html
Nursing Times 27 April:
He said it was crucial to prevent a “second spike” and not allow the reproduction rate of Covid-19 – the number of cases that are likely to emerge from one person having the virus - to go back above one.
“Because that would mean not only a new wave of death and disease, but also an economic disaster, and we would be forced once again to slam on the brakes across the whole country and the whole economy,” said Mr Johnson.
“We defied so many predictions – we did not run out of ventilators or ICU beds"
He added: “I refuse to throw away all the effort and sacrifice of the British people and to risk a second major outbreak and huge loss of life and the overwhelming of the NHS.
“I ask you to contain your patience because I believe we are coming to the end of the first phase of this conflict and in spite of all the suffering we have so nearly succeeded.”
There are half a dozen other instances revealed by a search on ‘Johnson second spike’.
I have no idea what the government is trying to achieve though, because the actions seem designed to encourage a second spike. Seems that the key metric is not running out of ventilators and ICU beds, which is easily done by denying people access to them.