I am pretty confused by the BBC's stance
It seems to me that the BBC could be holding one of two positions.
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That the question of whether self-id trumps sex is a matter of opinion and Justin Webb was biased by voicing an opinion on this matter. This is my reading of the wording of their judgment. By this logic, it is then open season for complaints to the BBC on the many many articles that endorse without balance the opposite opinion (ie self-id trumps sex) for being biased in favour of the opposite opinion
2nd alternative - that self-id always takes precedent over sex to the extent that sex is no longer mentionable and that this is such a settled fact that it does not need any consideration of balance. If this is the BBC's position then there is no need to consider alternative opinions and indeed any voicing of them is considered bias.
If it is the second one then I guess then that is a matter for way above the heads of the complaints people and one for writing to MPs, FOIs etc on exactly when this became BBC policy that any mention of sex is automatically bias.