Pfizer's Covid vaccine has saved the lives of millions around the world and the Government has chosen the Pfizer jab over the much cheaper Oxford AstraZeneca for its autumn roll-out of boosters. However, as Pfizer hikes up the price of its vaccine and enjoys record-breaking profits, questions are mounting over the pharmaceutical company's behaviour. Reporter Antony Barnett considers whether its is unfairly profiteering from the pandemic, whether it has always played by the rules, and whether it is doing enough to stop people in poorer countries dying from Covid-19.