You mean this data? https://coronavirus.data.gov.uk/

If so, then don't just look at the positive tests but at the graph that shows tests performed. Positive tests goes up but tests performed is relatively the same. That tells you it is a real increase in positivity. It could be the start of another big peak, or not. Time will tell, but you'd think going through the last years one should pay attention to such statistics. Because if you start taking measures only when you are back to 100.000+ cases a day you are a bit too late.