There is also what I consider to be a mix between independents and parlours, and they are what I would call the Group girls. I call them Group because they tend to work in a bunch of 4 or 5 and they are controlled by a pimp/madam. They also tend to be Eastern European.
I saw quite a fair few of those types in 2011, at a time when I was only starting to use Adultwork more extensively and therefore inexperienced in scrutinising which girls were good and which were bad.
I have to say that the Group girls were much, much worse than the parlour girls. With the exception of 2 girls I saw, I found them to be generally disinterested, distant and mechanical in their approach. Also the girls didn't do the services that were advertised on their profile.