I don't think Orwell has anything to do with this. British society is very different to, say, American society in many ways. History will probably help explain things.
Like many European feudal societies, there's a long-standing expectation that government is expected to care for the citizens. In spite of how individuals acted, there have been laws to protect peasants from predatory landlords (even if their application wasn't perfect). In addition, it was the role of the local "government" / community to care for their homeless for a very long time.
What I'm trying to get at is that the suspicion of government is not really there in the way that it exists in the USA. This allows the government to hold vast powers and, for better or worse, be trusted that it's not going to abuse that (against its own citizens at least).
On CCTV specifically: in the modern day, in practice, most CCTV is concentrated in London. This means that the vast majority of the UK is not really affected by this surveillance. Also, I do recall most CCTV is privately operated, not state, and most organisations delete it within a few weeks to save money.
What this means is that, in practice, you don't have a Bourne Identity situation where the police can watch a live feed of someone running through London. They have to acquire that information afterwards through a series of requests and subpoenas to different companies.