It was just two years ago that Oxford University researchers first trialled the vaccine that would change the way the world has fought coronavirus.

But with the battle ongoing - where do they think we stand now?

Is enough being done to prepare the UK and the world for future Covid threats?

And what might the next generation of booster vaccines look like?

Oxford Vaccine Group director Professor Andrew Pollard, who was the chief investigator of the breakthrough vaccine trial two years ago, tells Science Editor Deborah Cohen what you need to know.