I'm not sure we can blame Tuesday. We seem to have a few good days then a couple of bad days. At the moment, as the graph and the green box shows, the overall weekly trend has been down for something like 17 days.
I got an email from them the other day saying that loads of people had been logged out of their accounts a week or so ago. I suspect that the rise in cases was caused by the fact that people who received a positive test in that period would likely remember to log in and record it. Whereas people who don't are likely to not even think about it (I didn't, it's only the reminder that makes me update it so when I didn't get a reminder for a week I didn't record anything). So given that this data is based on percentages it'll be skewed by the drop off in people recording that they're fine.
