Is the Pfizer vaccine as effective as claimed?

There have been multiple upates to this story. The latest (March 2023) is here.

17 August 2021 Update: After sending a letter to The Lancet in May 2021 summarising our concerns described here about the study, the editors (when prompted 3 weeks later) said they were waiting for the authors to respond before they could publish the letter. Four months on we…