I've read a few newspaper articles about clients being arrested (e.g. External Link/Members Only ).
I also understand that punters can be charged for using workers who have been trafficked, even if they were unaware of this.
Correct but still yet to hear of anyone who has been charged, or convicted of this offence and it wouldn't necessarily have to be in a brothel.
Regards the newspaper article, please be aware what you see in print can be factually quite incorrect - I have seen basic errors in reporting things I know quite a bit about, errors that could mislead.
So I always read between the lines, and think about what they are trying to say or the image they are putting across. Firstly police can be a bit heavy handed, which makes the whole thing look much more dramatic than it usually is (I've witness Newcastle police 'kettling' students a few years ago, it was a tiny handful of small students, completely swamped by probably twice as many, much bigger, much taller officers).
This sentence is directly from the article
"Later, two men with their heads covered by coats were handcuffed and escorted into a waiting police van. These man were later identified to be clients." makes me think everyone at the premises was arrested, they'd say they needed to work out who was who, in the heat of the moment they don't want the brothel management slinking off so everyone is lumped in together. Doesn't say they were charged with anything and I very much doubt they received anything more than an 'on your way' afterwards. Ok best avoided and it's a hazard of visiting but still doesn't make it illegal to visit brothel. Contrary to popular belief arrests without charges (and without any evidence) are not uncommon. Police in a high pressure situation tend to arrest first, ask questions later.
Here's home office guidance to actual offences and if it ain't there it's not illegal;
External Link/Members Only