The system - and this is going to sound a bit cranky - incorporates the news media, which is the only real means we have of creating widespread public awareness about the nature of the system. So if the system doesn't negatively impact on you personally in a fairly immediate way there's no real reason to believe there's a problem.
You just need to look at the reporting yesterday of the Arcuri scandal. Here's the BBC, which is the single most popular and most trusted source of news in the UK:
And this was a day after it was reported that Tory donors were starting to rebel against the government because they hadn't yet got the peerages they were promised in return for their donations. It was mentioned in passing in an article on the Tories being short of cash:
Every journalist working in the field knows all about this and they understand the implications perfectly, but they also understand that it's not in their interests to talk about it, so...
We know what to call this when it happens in Russia but British people have a really hard time dealing with the fact that they have one of the most corrupt and useless media systems in the world. Guarantee someone will call this a conspiracy theory. The point is that there doesn't
need to be a conspiracy because all of this is right out in the open.