I've just passed selection a few weeks ago and have a PPL. They say it doesn't really matter either way, but I think it's useful in the sense that it evidences commitment and motivation, especially when you're young. It gives them confidence that you really want it. It certainly shouldn't hinder you! They'll expect you to demonstrate a higher level of ability at phase 4 if you apply with a PPL, but they seem to be pretty fair with what they demand based on your level of experience.
Good luck