I have to admit though, there was one with regards to speed limits on national roads that I had to make a guess of, I didn't think it was the question so much but the way it was worded that was misleading me.
It sort of read that 70MPH was also the norm for 2 lane carriageways. (at least I think that was the one)
"The use of the horn should only be used in a emergency to alert someone that you are there"
And actually, the same goes for flashing of ones headlamps.
(not that most people use it for that reason, which I believe is being looked into and possibly being changed sometime in the distant future)