I've submitted a formal complaint to the BBC:
'The BBC is a national broadcaster bound to impartiality by law.
Britain's government ran a public consultation on gender self-ID, which has brought many issues into public debate and scrutiny over the potential threat to the rights of women and girls from transgender ideology. Many people are deeply concerned and are attempting to engage in rational, intelligent debate on the issue.
In his tweet dated 16/7 Dave McMullan, duty editor, producer, reporter BBC Radio 4 Today, admits he didn't understand the issues around self ID and the proposed Gender Recognition Act reform, yet boasts that he vetoed women who wanted the law to stay as is from coming on his show, using the term 'some horrific TERF'.
Mr McMullan does not have the right to shut down debate or pick and choose who can speak.
The term TERF is a mysoginistic slur, an insult against women, often used together with calls to commit extreme violence against women.
The BBC must investigate Mr Mullen's attitudes, language and behaviour.
He must apologise.'
I will keep Mumsnet informed.