Loyd is correct, there appears to be no distinct advantage to running
colonies with a wide entrance. I tried this about 4 years ago with several
colonies along with giving them a "ventilated" box over top of the inner
cover. I still have at least 8 or 9 colonies set up this way but I find no
effect on swarming or honey production. Those issues are better dealt with
by giving plenty of room in the brood chambers as well as honey supers and
young queens.  In addition, the British National supers and frames are NOT
compatible with the Langstroth equipment.You can modify things and move bes
over from one to the other, but why create the extra work. Been there and
done that. On the other hand, the British National equipment is nice and
fun to have if for nothing else a novelty aspect.  I still have a couple of
colonies housed in what was called the Kerkoff side-by-side ventilated
beehive.