On the BBC Today programme this morning, Baroness Grey-Thompson was interviewed about this year’s Paralympic Games, but she was referred to throughout as Dame Tanni Grey-Thompson. This is not the first time a Baroness has been referred to as Dame. It has happened before with Baroness Grey-Thompson and with Baronesses Bakewell and Neville-Jones. They were dames before they were ennobled, and it is always possible that the interviewers are not aware of their elevation to the peerage. (Somewhat odd if that is the case given that it is six years since Tanni Grey-Thompson joined the Lords.) Either that, or some presenters at the BBC simply don’t know the difference between a Dame and a Baroness.
I have never noticed a peer who was previously a knight being referred to as Sir.