No idea. But it's also well reported that one of the biggest reasons for low compliance was the lack of financial support for those that really needed it. A hell of a lot of people couldn't afford to isolate. From what I read there were plenty whose home and work situations were such that they could not stay at home or have the kids off school because of the financial impact on them and that drove a massive wave of under-reporting. Not a lot of low pay jobs can be done remotely and we're a country that relies on a low pay, low skill workforce. From my own experience I know there was a hell of a lot of parents who weren't even testing their children but filling in negative results every Monday morning.