Question normal

Currently, we are seeing two types of approaches in the contention of COVID-19 in Europe:
(1) Italy/France/Germany: following WHO's warnings, these countries have the highest level of contention, with self isolation of most of its population.
(2) UK approach: isolation of the most vulnerable, whilst the rest of population lead their almost normal lives.
Although each of these countries are in different phases of the pandemic, what can we learn from these approaches? What scientific arguments support each of them? According to current data, which is the most optimal approach (in terms of practicality, low mortality rate, low burden in health and economic services and overall)?