The priorities of flight are a direct quote from MATS part 1, word for word.
VFR flights come beneath Normal flights thus a lower priority.
Comments about not using all the airspace available seem a little strange, Quite frankly in my limited piece of CAS I use every bit of CAS available at various times throughout my duties.
Again I do not limit zone transits and anyone who has flown whilst I have been on radar can confirm that , I may ask for an alterration of track or level and have a few times asked for orbits, but it is a very long time since i have refused zone transit and then I believe it was because I had an emergency situation at the time.
To those who feel we deliberatley limit GA and VFR traffic for commercial reasons I say visit those units on a busy day and view what actually goes on in the Ops room.
As ATCOs we do not think in a commercial mindset we think in a safety mindset.
Safety comes First at all times