What's really interesting (worth noting?) is that it turns about the BMA board has its own Board of Science.
So if they have this why did they ever discuss and pass a position on a medical issue based on political allegiances rather than ask their Board of Sciene.
... The BMA, of which I chair its board of science, has a long history of appraising evidence. The evaluation and dissemination of scientific and medical knowledge was the founding principle of the BMA in 1832. At that time, its focus was the management of a cholera outbreak; today the health issues are far more wide-ranging. ...
So clearly not a sudden change to actuall evidence.
... As the lead of the BMA evaluation of the Cass Review, I have no preconceptions and have every intention to lead our evaluation from a position of neutrality ...
Which is good to know, but you would like to think the main Board also worked on the premise.
(More and more it seems that organisations overseen / run by Boards are just disasters waiting to happen.)