Sam Coates of Sky News is tweeting that Whitehall is getting concerned about the sheer number of people who will be having to isolate in the coming days, some from getting covid, and some from having to isolate.
"One source said gvt modelling done under Hancock suggested this scale cd potentially compromise transport and healthcare"
"One government source called this another lockdown by the back door"
twitter.com/samcoatessky/status/1413224477450817536?s=21
Apparently the plan is to make the app less sensitive so that fewer people have to isolate.
Stopping isolations increases infections so not necessarily a great solution.
I'm sure all the planning is well in hand though.