Ok so we’ve tried the Canadian and US tests so lets try the UK one!
Im sure there are much better versions of this available online but lets try this one
91%. I missed the one on 18 year olds voting. But it was a tricky question, anyway. But I will admit, more than a couple of answers were WAGs.
8/12, 66%
Missed the ones for voting age, helmet laws, judge versus jury, and location of the Scottish Parliament. Guessed on EU size and the tax question.
58%. 
I scored better on the U.S. one.
(And technically, although I don’t hold a valid passport, I am a Brit, since I was born in Scotland!)
The only reason I got the helmet law question right was that I noticed the word “everyone.” Absolutes in MC questions are almost always wrong.
The trial by Jury isn’t true either
It can happen when the jury has been intimidated.
http://www.cps.gov.uk/legal/section15/chapter_q.html
It can happen in terrorism cases too.
And since when did setting up a business have to do with citizenship?
58%. I guess I’m more than half British. And I do mean “guess.”
83%
75%, in spite of a couple of embarrassing blunders.
58%. My English ancestors shake their heads.
I got a 95% on the U.S. one and a 58% on this one, which is perhaps understandable, given that I am American, not British. Are you really expected to know Council Tax numeric minutiae and nitpicking exceptions in helmet laws to be a citizen? I can’t think of anything like that on the U.S. tests.
58%. Apparently I know little to nothing.
66%.
I don’t feel bad- I didn’t miss any that a non-Brit should be expected to know.
66%
I guessed St. George, WRONG
The council tax fooled me.
The Helmet law and what women had no right to do also got me.
I was suprise at the lack of Monty Python based questions.
Brit here, only 83% - missed the helmet one (which I probably knew but didn’t think about), and blundered on number of countries in EU. It’s still a lot better than my US test score though!
I think a lot of these questions on both tests have very little to do with citizenship, but that’s hardly an original view.
66% - slightly shameful. I guessed wrong with the crash helmet, council tax (never been in that situation so didn’t even know you got a discount!), saints day (I guess St David) and voting.
17/18. Woot! I can go live with my parents and sibling! 
(missed the turbans. I wonder how well they, um, stack up against a helmet in the head-non-splattering stakes)
75%
Some really odd questions there. I only know about the council tax discount because I qualify. Who outside Northern Ireland knows what their holidays are? Number of countries in the EU? Bah.
Should have had at least one question where the correct answer is Mornington Crescent.
I got 5 of 12, which is pretty funny considering that I am a citizen (never lived there, though). I never had to take a test, just pay gobs and gobs of money.