Is it April the 1st already?
In the UK the government, via the CAA, grants each airport a Public Use Licence to operate. It is a requirement of the issuance of that Licence, that the airport is available to all users without hindrance. The fact that the aircraft owner (I'm thinking of GA aviation here) can be priced out, by any airport authority, is for another debate. I have not seen the Licence for some years, but it is a requirement that a copy has to be on public display as a statement of UK Government Law.
It is for this very reason that GA light aircraft can not be banned from MAN, as officers of MAplc wanted in the mid-1990s, when R2 was under discussion; the resident GA community and business aircraft users threatened to invoke their Licence Right to Access, as what the airport authority was proposing would have been discrimination against a sector of aviation. Should the government withdraw Licence approval, then all flying activities would have to cease forthwith, leaving only the feathered variety flying.
P.S. - just noted that Higher Archie has now posted along similar lines.
P.P.S. - Shed: well written posts, esp # 485 on Manchester-6.