I'm pleased that Emma Barnett consistently pushed the point that sex is a protected characteristic. She'd also done her homework on the legal disagreements about how the GRA and the EA interact.
EB: ... the 2010 Equality Act sets out sex as a protected characteristic. How will you guarantee women's sex based protections when you've reformed the Gender Recognition Act?
JS: Look, I think that - you know, trans - trans women are women. And women, whether they are cis or whether they are trans, whether they are gay, whether they are straight, whether they are bi, whether they are black, whether they are white, whether they are asian, whatever their mix of characteristics are, you know - you know, nobody is just one thing on its own, and equality law does not work if it either tries to elevate - you know, one protected characteristic above others, or doesn't recognise that people have these multiple characteristics. Because we all do, and we all face different ...
Equality law does not work if you cannot identify which protected characteristic is the reason for the discrimination (sometimes two or more) and in most cases it also doesn't work if you cannot identify an appropriate comparator - i.e. someone in the same situation but who does not share the relevant PC.
Clearly the law is not Swinson's area of expertise. That's fine, right up to the point where she advocates changing the law.