'Freedom Day': What will it take for restrictions to be lifted?

It was announced this week that COVID restrictions in England will continue for another month, but what factors does the government base these decisions on? A fortnight ago, the prime minister said "I can see nothing in the data", so what has changed? And how will the government decide when it is 'Freedom Day'? In this episode, host Dermot Murnaghan is joined by virologist and comedian Ria Lina and Isla Glaister from Sky's data and forensics team.