[I]n the United Kingdom, my party is starting the largest renewal of policy and ideas in a generation. ... If we get this right, we stand at the dawn… - Kemi Badenoch

The law is confused because times have changed and words in law are being re-interpreted to meanings quite different from what legislators intended. Clarification is required. Not just to protect the privacy and dignity of women and girls, but also to protect those people with gender dysphoria for whom the law was set up to protect. These transpeople were going about their lives in peace, until predators started exploiting loopholes in the law by calling themselves trans with no evidence beyond their self-identification.
Sex and gender, terms once used interchangeably in the law, now mean different things with significant implications. This is being exploited by all sorts of activist organisations, most notably Stonewall for their own agenda. That is why we are today pledging that, if we form a government after the [general] election, we will clarify that sex in the law means biological sex and not new, redefined meanings of the word. The protection of women and girls' spaces is too important to allow the confusion to continue.

Reform [UK] is another left-wing party. They're arguing for the same things: nationalization, two-child benefit cap. They [Labour] would love to have a political fight like that.

It wasn't until predators started exploiting the loopholes that we are having to tighten this.
It is the behaviour of people who are choosing to exploit rights given to transgender people — because the definition is very loose — that we are now having to look at what we can do in order to protect women and children who are the most vulnerable in those single-sex spaces.
It is not easy, the ideal situation would have been if the predators had not chosen to exploit this loophole.
[Badenoch "insisted she was not saying transgender people were predators."] But there are more people who are predators than there are people who are trans.