Chaos and Epidemics
Australian conservative politician Craig Kelly's tweet seem to have gone semi-viral in certain online spaces. He cites higher COVID case numbers after the vaccination program began to denounce the efficacy of vaccination.
The disparity is so obviously caused by changes in the availability of COVID tests in UK over time. That being said, even if the 100% of the population was tested every week with a perfect test, large oscillations are normal. From the book Chaos: Making a New Science written in 1991: