The UK's plan has shifted because the scientific modelling showed we were on course for a "catastrophic epidemic".

A strategy of just slowing the spread of the virus, but not trying to stop it, would have overwhelmed intensive care units.

The modelling by Imperial College London has been heavily informed by the experience in Italy and is influencing decisions at the heart of government.

Their calculations predicted 260,000 deaths in the UK.

Instead the plan is to drive down the number of cases to very low levels, which the models predict will limit deaths from coronavirus to the thousands or tens of thousands.

However, this approach comes with a major problem - there is no exit strategy.

Without the immunity that would build up if people were infected, then cases would soar as soon as measures are lifted.

The report said these could need to be in place until a vaccine is available, which could take up to 18 months.

We are in this for the long haul.