Today I was told by the app to isolate until the end of Sunday.
The contact was last Thursday through a fence panel between tables in a pub garden as we knew the people at that table and all four of them have since tested positive.
The app alerted everyone on my side of the table, but didn't alert the people sat opposite me presumably because they were more than two metres from the infectious table, and through the fence panel which was at my back. There was some visiting between the tables, but not for longer than 15 minutes which is the contact tracing time period that the app recognises as "long enough" to potentially be infected, and two metres is the app distance limit estimated by bluetooth (broadly).
All the people at my table took tests today, all were negative.
We'll be taking another test on day eight (Friday). Two of those at my table take very regular tests as it is mandated for their work and they have always been negative.
My friends range in age from 20s to 60s and all four of the infected were in their 20s and unvaccinated.
Four of the eight people at my table were vaccinated, all but one twice.
I live in the South East and surge testing started here yesterday. Our cases are 89 per 100,000.
Prior to this, I know only three people locally who have had a positive test, all from a school setting, and that was April-ish last year.
For me personally, this has been a useful reminder that this is not over.