[On the case of Karen White, born Stephen Wood (and retaining male genitals), a sexual offender against children and on remand as a rapist. White had… - Janice Turner

TERF stands for Trans-Exclusionary Radical Feminist. But lately the definition has expanded to include any woman worried that permitting men who "self-identify" as female to enter women’s changing rooms or refuges unchallenged makes her less safe.

Stock is no right-wing bigot but a mild-mannered, dry-humoured, left-wing lesbian. An acclaimed philosopher who received an OBE last year, she teaches trans students, respecting their pronouns, and has written repeatedly in support of their human rights. It is bleakly ironic that she is accused of "endangering" others just for holding heretical views, when police have warned her to stay off campus and take security measures for her personal safety.

This is not a piffling problem. The BBC reality check team confirmed that 60 (48 per cent) of the 125 trans prisoners in jails are sex offenders. That compares with 19 per cent in the prison population overall. Yet, since women commit only 2 per cent of sex crimes, out of 8,000 women prisoners there are only 125 sex offenders. So if the 60 trans sex offenders were housed according to gender identity, it would create a sea change in women’s prisons. There would be 50 per cent more sex offenders; they’d be male bodied, physically stronger and have committed far more serious crimes, including 27 rapes, 13 sexual assaults and seven charges of sex with a child.