You are a bit wide of the mark Stevie. It is a real law and will involve a day in court and a fine if convicted. The chances of ending up in court will of course greatly depend on
how clever you are at avoiding detection. It's a bit like drink driving in that the chances of getting caught greatly depend on when and were you do it but it is not largely ignored.
This law will not be largely ignored but it will be hard to enforce per say. However, the old legislation is still on the books brothels will continue to be raided only this time the John's neck will also be on the chopping block.
Punt on till the END!!!!