Lucy is genuine, I have visited her myself. She is very skinny, but I think she is naturally that way (speaking as a very skinny person myself, I know it can be the case). But she looks almost anorexic, so if you don't like someone that thin, don't visit.
If you email her she will send you a face photo.
Her service is as described by previous posters, and I know she has quite a few regulars. So I don't think jamie 1 is her in disguise.