I'm just going to jump in here and point people who are lurking or new Mumsnetters to this thread I started in 2018 about a trans rights conference I went to in London, which was also attended a who's who of prominent figures on the TRA side of the fence, including Susie Green and other people from Mermaids.
My 5th post in the thread details the talk run by Susie Green.
We're Still Here Conference September 8th: A report from the inside
My anonymous attendance of this event apparently did not go down well with Mermaids, according to page 8 of their 2019 accounts. I quote:
"Despite working with the organisers to maximise security for the event, an individual with transphobic motivations still managed to infiltrate the conference and share their negative views of it on social media. Fortunately, the young person was not identified publicly, but this was the watershed moment that demanded we increase our security and vetting procedures across the board. Improving safety involves additional resource in terms of time, money and administration - which we have unashamedly committed ourselves to doing - but this means that some 2018 numbers were lower than originally anticipated, and in the period for 2018/19 we attended 131 events across the UK. Having put these security processes in place, we are back on track in 2019 to meet our targets for the next year."
Source
So, me turning up at a public event which was also being attended by JANE FAE, (a person who is an advocate of extreme porn), was the main safeguarding concern for Mermaids at that time.
...Ok hun.