There is no way we have only 500 cases in UK at the moment. There is at least a 15 day delay on average for a person to get infected, develop symptoms, get tested, and get results.
If the number of actual infections cases is growing about +33% each day, which is similar to other countries that have not enacted distancing measures, then there are probably at least 30,000 infected people in the UK today.
The key unknown is whether 10% of them will really need hospital care in order to survive. If they do, then this is going to be really, really terrible, and every day of further delay is going to cost thousands of lives.
We can still do something about it in order to dramatically lower the number of deaths. I found this website (not mine) that helpfully explains not only the nature of the problem, but many solutions that every individual can start to put in practice, without waiting for government action.
www.flattenthecurve.com/
@lindseyvvt, Even if you are among the lucky 80%+ who would end up getting so-called "mild" disease (which still often includes pneumonia so it's not actually that mild), how many unknown people's lives are you willing to put at risk in order to attend a concert?
We don't need to "stop living" because of a virus - but we do need to change how we live, for at least a couple of months and possibly more, in order to keep living with this virus