lots of replies to their tweet on this confirming that transwomen have been using women's wards for many years
And any incidents would not easily be established as males identifying as women in single-sex accomodation would have their 'sex' recorded as 'female' on NHS records.
Whilst female patients who have had their safety, dignity and privacy compromised by a male would be less likely to have reported or complained about this.
Cf the reponse to a woman who complained, January 2018
"A Lancaster mum whose bi-polar disorder left her believing men were conspiring to kill her said she was left terrified when she was locked on a women’s psychiatric ward with an “extremely male-bodied” transgender patient.
Philippa Molloy, 42, said she was “genuinely, absolutely terrified” because she had suffered a relapse in her condition that made her irrationally terrified of men – including her own husband. Philippa Molloy.
When she raised her concerns with hospital staff, however, she said she was not taken seriously and her medical notes implied that she was a “transphobic bigot”.
She said the NHS had failed to think through the implications of allowing patients to self-identify their gender."
www.lancasterguardian.co.uk/news/lancaster-mum-with-fear-of-men-locked-on-hospital-ward-with-transgender-patient-1-8963648