I don't think it has. There is certainly no sign of a second peak in the UK. There is a rise in infection rates to what they were a month ago (a fairly modest level, and expected as a result of relaxing a number of lockdown measures as well as being the inevitable result of the huge increase in testing) while hospital admissions and deaths from Covid-19 have continued to decline. As elder_cat says, there could possibly be a second wave, rather than peak, if infection rates continue to rise over the next month, but more litkely the latest figures will just turn out to be a continuation of the first wave. There really needs to be clearer evidence (increasing NHS 111 calls, increasing - not decreasing - mortality rates, and so on) to identify anything too worrying on a a national scale (local outbreaks, of course, are a different matter and so far seem to be being successfully dealt with through local measures).