Well yes, but that was a side show. And a convenient excuse to not attempt same sex marriage.**
Given the ample evidence of those who used to contribute to FWR, the main pressure came from those, whether they thought of it as queer politics, but was part of the same movement that got women's studies closed in universities and gender studies opened instread.
It was the start of the now, sadly entrenched culture, that says sex and gender are the same thing, and you are not tied to a biological reality, but can have a reality based on what you identify as.
Although it is true, that the GRA or rather the GRC was in reality a very minority interest. To date somewhere in the region of 10,000 GRCs issued in the UK.
** And as know once same sex marriage became legal Stonewall was then floundering around for something for them to champion so as to go on having well paid jobs. And only then did them try and make same sex attraction somehow the same wanting to change your "gender" identity.