Sarah Phillimore was asked to speak about the challenges she have as a disabled barrister but seems to have been disinvited for her gender critical views.
https://twitter.com/SVPhillimore/status/1767506904228499552
She posts her letter to the relevant Minster, Robert Halfron, in the thread below.
There is some suggestion that it might be because of not enough days to arrange security but as she says, she would have been offered a rearranged date if that was the case.