Allow me to reiterate: whether the intro is "clear" or the structure "logical" shouldn't be the issues (and I don't think logic is on anyone's mind in this discussion).  The issue should be whether the random person is going to come away more confused than before (i.e., *to whom* is the article clear (or not)?)  If Jza84 reads it over and over, I suggest it will remain clear to her/him.  On the other hand, the random person looking for answers about the administrative geography of the UK is likely to find it unclear for the reasons mentioned above.