Which ONS data are you referring to? The currently published data indicates the wave has at least plateaued, as I read it, in all but the youngest age groups.
Most recent summary: https://www.ons.gov.uk/peoplepopulationandcommunity/healthan...
Most recent data: https://www.ons.gov.uk/peoplepopulationandcommunity/healthan...
Methods: https://www.ons.gov.uk/peoplepopulationandcommunity/healthan...
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.
OP was not accurately representing the facts.