I was shocked to see that the Covid app has been alerting people who have been in contact with a positive case 5 days previously.
This could probably explain some of the alerts people had been getting where they can’t work out where the contact has come from.
It’s surprised me because I assumed it was within 48 hours, like all other contacts?!
news.sky.com/story/covid-19-nhs-test-and-trace-app-being-updated-to-ping-fewer-people-to-isolate-12371001