Zoe is Ian Manachevitz's on again off again girlfriend. She runs an art gallery out of her loft which hinted, that her work is based around erotic female figures. Mark was uncomfortable meeting her because she tried to seduce him when they first met while she was in a relationship with Ian. After breaking up with Ian for good, Zoe left Ian's collection of sexual toys to Mark when she moves to her loft.
She also hinted that she also has her collection of sex toys and had to stop Ian for using hers. It was her that influence Ian to have a collection of his own.