Boris Johnson announces four week nationwide lockdown starting on Thursday

The speaker expresses gratitude and shares optimism based on scientific and medical advisory. They discuss the prospects of improved drugs, like dexamethasone, and a realistic vaccine. The speaker highlights the confidence in rapid testing being rolled out nationwide. In the meantime, tougher measures are necessary until December 2nd. The speaker concludes with a reminder of basic safety measures: hands, face, space, and getting tested if symptomatic.

What is the significance of rapid turnaround testing mentioned in the text?

What is the overall message conveyed at the end of the text?