Why is there talk of an EU-UK 'vaccine war'?

Our reporters Gráinne Ní Aodha and Michelle Hennessy join us to examine why vaccines are causing tensions to almost boil over between the European Union and the United Kingdom. The former is now weighing up plans to halt exports of jabs to countries with higher rates of vaccinations than its own member states. We look at the origins of all this (it's not Brexit again, is it?), what it has to do with the 1970s oil crisis, and why a single pharmaceutical plant in the Netherlands is in the spotlight.