Even if you want to separate sex and gender and define sex using sexual characteristics (not actually a good idea, see works by Judith Butler and Julia Serano among others, although I wont fight that point here), almost no sexual characteristics are immutable. The only ones that I can think of are chromosomes and gametes, but chromosomes aren’t even binary (or observable without a microscope) and gametes arent a good basis either – should being infertile affect your sex?

Not really. The current ruling party (Labour) are pretty crap but nothing compared to the openly genocidal US Republicans. And the 3rd largest party (Liberal Democrats) are pretty socially progressive.

Disdain for an entire country of diverse people based on the (stupid, bad) actions of the minority in power is a bit much…