The final lockdown. But is it really?

As kids go back to school this morning, and the country looks ahead to the key dates along the path out of lockdown, the Channel 4 News Factcheck team ask: how safe are schools? Does the latest data show that the vaccines are working? And why, if the most vulnerable have received their first dose, don’t we open up more quickly? Does our Covid “roadmap” mean that this could be the final lockdown?