I'm surprised that one thing hasn't come up yet at the Covid Inquiry.
Late summer 2020, when Covid cases were low, there were interviews which stated that although the AZ vaccine was in the last stages of its trials there wasn't enough Covid 'in the wild' to properly test its efficacy (right word??).
From my memory it was only a few weeks later that 'Eat Out To Help Out' was announced, without any scientific approval. This undoubtedly spread the virus and helped test the efficacy of the vaccine.
Odd coincidence that nobody seems to have noticed?