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I think if you are contacted by track and trace by phone or the app, as a close contact of someone subsequently found positive, and having seen them within 2-days prior to their symptoms starting (or their + test), that current rules would be 10-days isolation for you regardless of any test result you have.
In fact, you would not strictly be eligible for a test unless you got symptoms.
That depends on your app having pinged your friend’s, or them having given your name as a close contact. I suppose if you don’t get a call then you have no legal compulsion to self isolate, but maybe a moral one?
Edit to say : sorry to hear that, I hope your friend recovers quickly
I had dinner on Monday evening with someone who got a positive test this morning, most likely from an exposure last Saturday. Test booked, but from what I’ve understood the probability of a false negative is too high to stop isolating even if it’s negative?