I walked once from a B&S, big flashy house in Central London, bunch of Brazilian girls in there. Girl in the photo answered the door, took me to a room then left, then a different one came in to fulfill the booking. TBH she wasn't bad looking but I didn't like the setup or the deception. Felt good walking out and have never regretted it.
I did however regret not walking from one years earlier, maybe my 3rd or 4th punt so I was still a bit green . She was much older than billed, likes didn't match profile, just awful overall. I keep meaning to leave her a bad review, will get round to it one day...
Moral of the story - remember this is the service industry, you are a paying customer. If you don't like the girl or the setup then just turn away, you can do it any point up till you're naked / inside her lol. Don't be shy or worried about upsetting them if they have deceived you in order to get you in there!