I think a lot of people have started panicking on this thread, and I can understand why! There's a lot we don't really know about Coronavirus yet, so information keeps changing and that also breeds uncertainty and fear.
I actually think that the testing program we have going on in the UK is working reasonably well - we are doing lots of testing, which is good. We are still doing contact tracing. There's the scheme of 100 clinics and hospitals checking people with flu like symptoms, and we are checking people in icus to try and avoid what has happened in Italy.
As others have said, PCR is a time consuming process that can't really be sped up. There are limited labs doing the testing and limited people able to do it, so I think we are doing well in testing as many people as we can.
We were told with the cases yesterday that most had a known source, only a few are community transmission - that is encouraging. We knew this week would see a spike in cases due to all the people in Italy over half term.
I do think there is a bit more the government could be doing, but I don't think we should be doing mass closures yet. And I don't think it is time to panic yet.
Practice social distancing as much as possible, wash your hands as much as possible, try to stay away from conspiracy theorists ;)