If you've had it, how/where did you catch it?
Recently one friend caught it from attending a dinner party - yes, flouting the rules! There were 7 people at the dinner party and apparently they all caught it. He was notified by T&T.
Another friend and her husband caught it but have been so cautious, sticking to the rules, wearing masks etc. They've no idea how they caught it! They developed symptoms and got tested (no T&T).