Not sure your average Joe could stump up the necessary to get an injunction to stop publication or the necessary to go for a breach of privacy after publication Dazzler.
Much easier if you're Max Moseley or a Prem manager.
I do think the issue of prostitution is an interesting one as I'd have thought that paying someone for sex involved illegality though it isn't always clear who's on the wrong side of the law, punter or pro.
1. Legal aid would be available as would no win no fee agreements. Given the Mosley judgment, most solicitors would see such a case as a sure fire winner so would be willing to take the case on on a no win no fee basis, even if the client were not eligible for legal aid. So there is no issue here about access to justice.
2. Given the above, newspapers will now think very carefully about printing stories of this type about "average joes" (an interesting analogy is the way libel cases now work. In the old days newpapers thought they could grossly libel average joes with impunity as legal aid was not available for libel cases and fees for such cases were astronomical. Nowadays, no win no fee agreements are available in libel cases and solicitors do take a lot of cases on on such a basis for average joes, knowing that - where the libel is a gross one - the newspaper will end up paying their fees, hence greater protection for the non-rich libelled person).
3. Paying for sex is not illegal per se (though related activities like running a brothel and soliciting are).
4. Mosley did not pay the girls for sex, narrowly defined. He paid to spank and be spanked, caned etc. I know a few girls involved in that scene and they got in to being professional spankers/spankees through actually being genuinely into that kind of thing - i.e. they are turned on by being spanked etc and given that some people are willing to pay to spank them thought, why not? They do not sell sexual services as such and will not thank you if you call them prostitutes (though I think the distinction is a bit of a dubious one).
Generally, I am all for the class war angle on things, though I really don't think you can shoehorn the Mosley case into it (though the Sun played the class card on the issue, funnily enough).