At first glance it appears that, at 70%, Oxford-AstraZeneca's vaccine offers less potential protection against Covid-19 than the 95% protection potentially provided by vaccines being developed by Pfizer and Moderna.

However, in this podcast edition, Professor Jen Rogers tells Science Editor Tom Clarke why there is very legitimate cause for celebration at the Oxford University interim data results.

And she goes on to explain why attempts to compare the three leading vaccines are quickly flawed, along with everything else you need to know about the latest breakthrough in the battle against the pandemic.