In particular, it's worth noting that the ONS survey tries to estimate an answer to the question "in the given time period, what proportion of the population wo

In particular, it's worth noting that the ONS survey tries to estimate an answer to the question "in the given time period, what proportion of the population would have tested positive?" Because people tend to continue to test positive for a reasonable period of time after they are first infected, this should be a lagging indicator of any peak in new infections having occurred.