As said above, I've took a chance on a few vivastreet girls, it's very hit and miss with a large chance the girl in the pic isn't going to be behind the door waiting for you, one girl very similar to flory turned out to be a size 20 plus, big huge monster I had to walk from.
If they are genuine they are likely to have a AW profile in the same post code, if you are told to go to a different address other that the advertised post code is NG7 and they send you NG3 just skip it, it will be fake.
Again as advised stick to well review girls or run the risk of disappointment, always be prepared to walk if your either unhappy with the girl or feel unsafe, the "I've left my wallet in the car" can be your best reply to a fast exit.
