I think that if Labour get in which seems likely (in some shape or form) then the Nordic type model will be proposed. Most of the top rank in Labour, Harman, Yvette Cooper , Seema Malhotra, Jacqui Smith all fervently support this model. It will be proposed under anti trafficking legislation and I think it will be hard to vote against it. For the past 3-4 years there have been people saying that it's never going to happen, but only last year Canada, Northern Ireland and Republic of Ireland voted for the law, so I don't think it's fear mongering at all. With Germany and Netherlands both having serious calls to rethink their laws -I would say the tide has definitely turned.
Much will depend on how the legislation is written. For example Canada has enacted their own law C-36.
section 213(1.1)
It is an offence for anyone to communicate:-
“with any person — for the purpose of offering or
providing sexual services for consideration — in a public place, or in any place open to public view, that is or is next to a place where persons under the age of 18 can reasonably be expected to be
present.”
Would they consider places like aw/forums public? - Perhaps, it is unclear as details of the enforcement of the law in Canada have not really come through. The point is you don't have to be caught with your trousers down, just communicating with a service provider to obtain sexual services is a criminal offence.
A lot of black and white thinking goes on when this topic is raised. The aim of the Nordic type models despite the rhetoric isn't to end prostitution (I'm sure they accept that this is impossible). The aim is to punish the purchaser (men) in the hope of reducing demand and money for services or at the very least make it much more uncomfortable and risky. The threat of having a criminal record or being on the sexual offences register would certainly put off many casual punters and that is what the aim is.
Obviously such legislation won't end prostitution, however I think that balance of power would switch much further over to the SP and prices would go up. There would be a big conflict of interest if it's illegal for the punter to buy but not the SP to sell, because she will be less concerned about discretion and your privacy. If the authorities ask her for details of her clients , contacts she will sing to high heaven because she has committed no crime whatsoever, this is how it work in Sweden. Punters will have to think twice about complaining about poor service/ripp-offs if they are doing something illegal - she can just threaten to contact the police. Reviews and details will be much more scarce and less general information will be available so there will be more opportunities for scammers.
I think that we would get a market more like the USA (which I think is pretty awful). You won't be able to be sure of the scammers and ripp off merchants/ busts etc, so punters will just pay more for reliable providers who will put their rates up rates they and may start to ask for references and all that bollocks.