PM claimed that concern about asymptomatic transmission is hindsight.

On March 26 Yvonne Doyle of PHE said this was "a crucial issue", that while the extent of it was still unclear "in theory" staff could infect patients this way and so "precautionary principle" needed.

And this from SAGE in January

TThere is limited evidence of asymptomatic transmission, but early indications imply some
is occurring. PHE developing a paper on this."

Starmer clearly knew stuff like this out there. So why did he not throw it back at the PM in the chamber?

Suggests he's adopting a strategy of trying to give Johnson the rope and let others do the hanging