[AlexCoventry]

It depends who they are. (Ha ha.)

That's one perspective on anatta, but not a particularly useful one. You may find this interesting:

http://www.accesstoinsight.org/lib/authors/thanissaro/selves...

  If you've ever taken an introductory course on Buddhism, you've
  probably heard this question: "If there is no self, who does the
  kamma, who receives the results of kamma?" This understanding turns
  the teaching on not-self into a teaching on no self, and then takes
  no self as the framework and the teaching on kamma as something that
  doesn't fit in the framework. But in the way the Buddha taught these
  topics, the teaching on kamma is the framework and the teaching of
  not-self fits into that framework as a type of action. In other
  words, assuming that there really are skillful and unskillful
  actions, what kind of action is the perception of self? What kind of
  action is the perception of not-self?