But the obstinate fact is that just over a third of the electorate voted leave. In no way does that qualify as "the British people have spoken" or that "the electorate made a choice that was clear-cut and decisive." The fact that we are still arguing about it here and in every bloody pub in the country is that the result was very divisive.

Just over 1/3 (of the electorate) voted 'leave'.
Just over 1/3 (of the electorate) voted 'remain'.
It qualifies as "The electorate made a choice" in that the percentage voting 'leave' outvoted those voting 'remain' by 52:48 (approx.)
Whether you look at percentage of available voters, percentage of those who actually voted, or percentage of the whole population, the result will still show in the ration 52:48

The fact that we are still arguing about it here and in every bloody pub in the country is that the result was very divisive.
Sorry, the meaning of that sentence is unclear.