Any party with a chance of winning gets coopted.
The only real way to change is to participate in internal party politics machinery, and be prepared to play dirty, because they certainly will.
Just to expand on this. It is just recognising the state of current situation. A lot of people in the UK support the state in some form or another and if the state tells you encryption is for terrorists or criminals then as far as they are concerned it it is for terrorists and criminals. Almost everyone in IT *might* grumble about it but that is as far as it goes.
People outside of that view point are seen as eccentric, crazy or "conspiracy theorists" even after you point to real abuses of the current snooping from GCGQ (e.g. people spying on their former spouses) that has rock solid evidence.
There is no political will in any mainstream party, even the non-mainstream ones don't care. The citizenry is apathetic, the professionals in the industry that work here are apathetic. In fact the very opposite exists, people seem to love it when the politicians do tyrannical things. There is also no real difference in the mainstream parties. I haven't voted in years because there is nobody to vote for who is worth a damn.
I am so fed up of fellow citizens. I am moving once the COVID situation is resolved as mentioned in another comment.
The NHS is a massive money sink that always requires more money to keep on operating. I've heard the chant of "Save the NHS" since I was a child. As someone who parents are Labour voters (my ancestors used to work in the mines) even they are starting to think it might not be worth it.