Anything in the document can come up in the test, so know it all!
As for the question on the distance between airports, I don't remember one in the test I did. However, as I remember, it is multiple choice and therefore I would imagine that out of the 4 choices, one of them would be screamingly obvious?
i.e. Distance from Manchester to London (I don't know the official answer myself however I would imagine it's something like this)
a) 20 miles
b) 200 miles
c) 1000 miles
d) 2000 miles
Common sense maybe? It's not too hard to figure out. Learn UK geography and ROUGH distances. Instructors at the college have told me they get so frustrated when people turn up and haven't got a clue where certain places are (not exactly, but the vicinity...)
Hope that helps.