The alternatives are even more power-mad, fundamentally illiberal parties (Reform, Conservatives), equally pearl-clutching ones that will likely continue on the same road as Labour (greens) and unreliable figures that will flip-flop as soon as they are in power (libdems).
What's left? Count Binface, I guess.
Reform are against it https://www.theguardian.com/politics/2025/jul/28/reform-uk-v...
Even the more extreme Restore are against it, and against Digital ID https://www.restorebritain.org.uk/restore_civil_liberties
The Greens are ... well they wanted to amend it in 2024 to include a ban on fake news, but that could turn into a mechanism for censorship.
And Lib/Lab/Con were all for building even more on top of it in 2024: https://www.handleygill.co.uk/handley-gill-blog/general-elec...
There are no 'liberal' parties in the UK.
And yeah, I agree that there is no natural home in UK politics for social liberism. Hence why quipping "they keep voting for this" is just pointless - there are no realistic alternatives, what we have at the moment is the least worst and it's still pretty bad.