Have just taken the first one for fun and only got 75% despite having lived the majority of my 50-odd years in the UK (with a couple of short exceptions).
I'm a bit bemused at how irrelevant some of the questions are to most people's daily lives and just how much history there is in there (and I'm a librarian, I love trivia, but on a daily basis it's not as much use as, you know, how do you recognise a cycle path, or what's the current currency, or what's the emergency services phone number, or what you call the professional tradesman you need to call to unblock your toilet, for instance).
I also take exception a bit to some of the answers ("British Queen"? Shouldn't it be British Monarch, really?) and in the first test alone I spotted a syntax error without even trying....still, as long as people know sailing and rowing are terribly popular sports (especially at universities in the south of England, in my experience), and surfing isn't (I mean, it's a bit working class, isn't it, surfing....) [Joke, just in case anyone thinks I'm being serious....] and what the symbol of the House of Tudor was, everything's just tickety boo....