It's an interesting question, just as there's a debate about the proposal in the current Criminal Justice Bill to have an alternative to fines etc for street soliciting. I wonder how accurate the 'hard facts' were.

I know one group who were thinking of putting in a bid to run one of these 'educational' courses. They'd have done it somewhat differently from the usual 'you're a punter and that's WRONG, all prostitutes are horribly exploited' approach...

Unfortunately, nothing came of it, but getting state money to do a 'here's how to be a good client and avoid the problematic areas' course would be really good 

Basically, no. They don't control the work, for example.

There is a crime of 'conspiracy to corrupt public morals', which was created decided to always have existed in the early 60s when prosecuting someone who published prostitution ads, but its only other outing was ten years later when going after the 'alternative newspaper' International Times for publishing gay contact ads.

A look at, for example, Boyz or QX magazine (gay scene guides including very explicit escort ads) would suggest that no jury is going to convict for either of these now.