Do pray tell, what are they?
ERSA is a good place to start.
In some cases the exclusion is explicit, no non-VH, no private category, or effective exclusion by making minimum charges the equivalent of, say, a B-717.
In one case, it is RPT only.
And, before you jump in, I am not talking about Class C/D airspace airfields where certain pilot categories would be excluded by regulation.
Tootle pip!!