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So, like buses, vaccine approvals, in the UK at least, seem to come in threes. First Pfizer/BioNtech, then Oxford/AstraZeneca and now Moderna have been given authorisation to be rolled out across the country. But, Britain, for the moment, is going it alone deciding to postpone second doses to up to 12 weeks. Is this the right thing to do? It鈥檚 a controversial question, and one Tim Harford asks a panel of guests: Professor Beate Kampmann, Professor Akiko Iwasaki and Professor Sir David Spiegelhalter on this week鈥檚 How To Vaccinate The World.

Producers: Sandra Kanthal and Josephine Casserly

For listener questions please email vaccine@bbc.co.uk