"the system presently doesn’t track whether an individual who has been warned to self-isolate ultimately contracts COVID-19."
An absolutely basic metric not being collected.
Just go and self-isolate for 2 weeks. We don't even want to know if we're wasting your time. We certainly don't want to know if we should be telling you to get tested instead. And did the Committee not challenge her on this? Surely even though they're MPs a Science & Technology Committee should have some inkling about this.