British people have a view of Christianity that closely resembles what Americans would call "civic churchianity". Little of the true gospel is preached, and all you get is a more like a smoagsboard of traditions, national (British) culture, and intellectual fads. They won't know this is NOT genuine Christianity because their government schools and public schools have "religious studies" that teach something similar. I think the Queen is probably a true Christian, but Diana was definitely living in sin.
Poeple that go to non-conformist churches, house church groups, or independent/baptist churches (which are outside the Baptist Union of Great Britain) have a better understanding of truth. But they are only about 2% of British populations.
Much of what we know as biblical Christian way is perceived as "American fundamentalist Christian beliefs" in Britain in general. I heard that on some very popular Christian websites like Rapture Ready, Crosswalk, etc, there are so few Christians from Britain visiting these sites that there are more people from Australia accessing them than those of Britain, despite Australia has 20 million people versus Britain's 55 million.